Introduction to the technical content involved in web development

Introduction to the technical content involved in website development - back-end PHP (1) /xiaochenXIHUA/article/details/141000752?spm=1001.2014.3001.5501

I. PHP's common functions

1.1, PHP folder of common functions

**PHP's directory common functions**
serial number	Catalog Common Functions	clarification
1	$_SERVER['DOCUMENT_ROOT']	Get the root directory of your PHP project
2	dirname(__FILE__)	Get the directory where the current php file is located.
3	is_dir(file path or file path and name)	Determine whether the current content is a folder directory
4	scandir(directory path)	List the files and directories in the currently specified directory
5	filetype (file path or file path and name)	Returns the data type of the file, [file] for files and [dir] for directories.
6	opendir(file path)	Open a folder and return to the folder resources
7	readdir(directory resources)	Reads the contents of a specified directory resource one at a time
8	closedir (directory resources)	Close open catalog resources

Implement a simple catalog content browsing function as shown below:

1. Create a new file named [ ] with the following contents:




<html>



 



<head>



    <meta charset="UTF-8">



    <title> Testing common PHP functions </title>



</head>



 



<body>



<?php



 



// Specify the content type and encoding format of PHP pages




header("Content-Type:text/html; charset=utf-8");



 



//Get to the root directory




$rootPath=$_SERVER['DOCUMENT_ROOT'];




echo "The project root directory is [$rootPath 】 <br>";



 



//Directory operations




$curfilepathname=__FILE__;




echo "The path and name where the current program is located is:$curfilepathname <br>";



// Determine whether the current content is a path




echo "【$curfilepathname ] is a path: ".is_dir($curfilepathname)."<br><br>";



 




$curfilepath=dirname(__FILE__);




echo "The path where the current program is located is:$curfilepath <br>";



// Determine whether the current content is a path




echo "【$curfilepath ] is a path: ".is_dir($curfilepath)."<br><br>";



 




$curdirallfiles=scandir($curfilepath);




echo "The directory where the current program is located [$curfilepath All files under] are: <br>";




showdir($curdirallfiles,$curfilepath);




echo "<br><br>";



 



//Specified directory




$testPath='E:\AllSoftware\phpStudy\PHPTutorial\WWW\php\test';



 




if (is_dir($testPath)){



    echo "[$testPath] directory reads: <br>";



    //Open the specified directory




    if($curOpenDir=opendir($testPath)) {



        The //readdir method reads one item at a time.




        while (($file=readdir($curOpenDir))!==false) {



            // Get the full file path and file name.




            $fullPathFile=$testPath."\\".$file;



            // Get the type of the file




            $fileType=filetype($fullPathFile);



            if($fileType== "file"){



                echo "The file type is [$fileType],[$file] is the file, the full path and name of the file is [$fullPathFile]<br>";



            }



            else{



                echo "The file type is [$fileType],[$file] is the directory, the full path and name of the file is [$fullPathFile]<br>";



            }



 



        }



        // Close the specified directory




        closedir($curOpenDir);



    }



}



 




echo "<br><br>";



 



 



function showdir(array $curdirallfiles,$curpath)



{



    foreach($curdirallfiles as $key => $value){



        // Filtering . and . as operations that return to the previous level




        if ($value=='.'||$value=='..'){



            echo "<a href='./?fullpathname=$curpath'>$value</a> <br>";



            continue;



        }



        



        $value=iconv('gbk','utf-8',$value);



        $fullPath=$curpath."\\".$value;



        if(is_dir($fullPath)){



            $fullpath2=$fullPath.'\\'.$value;



            //Display directory icons and directory names (and directories can be clicked on to see the contents of the files and folders they contain)




             echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value</a> <br>";



        }



        else{



            //Display file icons and file names




             echo "<img src='. /images/files.png' width='20px' height='20px'/>$value <br>";



        }



 



    }



}



 



?>



 



</body>



 



</html>

2, and then create a new file named [ ], and the content is as follows:




<?php




header("Content-Type:text/html;charset=UTF-8");



 




$fullpathname =$_GET['fullpathname'];



 




$curpath=dirname($fullpathname);




$curdirallfiles=scandir($curpath);




showdir($curdirallfiles,$curpath);



 



 



function showdir(array $curDirAllFiles,$curPath)



{



    foreach($curDirAllFiles as $key => $value){



        // Filtering . and . as operations that return to the previous level




        if ($value=='.'||$value=='..'){



            echo "<a href='./?fullpathname=$curPath'>$value</a> <br>";



            continue;



        }



 



        $value=iconv('gbk','utf-8',$value);



        $fullPath=$curPath."/".$value;



        // $value=iconv('gbk','utf-8',$value);




        if(is_dir($fullPath)){



            $fullpath2=$fullPath.'/'.$value;



            //Display directory icons and directory names (and directories can be clicked on to see the contents of the files and folders they contain)




            echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value</a> <br>";



        }



        else{



            //Display file icons and file names (and can delete, move, copy files)




            echo "<img src='. /images/files.png' width='20px' height='20px'/>$value <br>";



        }



 



    }



}



 



?>

1.2, PHP file common functions

**PHP file manipulation**
serial number	File Manipulation Methods	clarification
1	fopen(file path and name, mode)	Open the file in the specified mode, and return the corresponding file resources.
2	fwrite(open file resources, need to write data)	Writes data to a file and returns the length of the data written.
3	fread(the resource of the open file, the length of the data to be read)	Reads the contents of a file of the specified length
4	fgets(open file resources)	Call this method once to read a line from a file
5	readfile(file path and name)	Reads files and automatically prints displays
6	file_put_contents(file path and name, data to be saved)	Save the content to a file (overwrite write, empty the file first before writing), if the file does not exist then create the file; the return result is the length of the saved content
7	file_get_contents(local file path and name or remote URL address)	Reads the contents of an entire file into a string

**File open (fopen) mode description**
serial number	Content of the model	clarification
1	w	Open by write, pointing the file pointer to the header and truncating the file size to zero. If the file does not exist it tries to create
2	w+	Opened in read-write mode, pointing the file pointer to the file header and truncating the file size to zero. If the file does not exist it tries to create
3	r	Open in read-only mode, pointing the file pointer to the file header
4	r+	Open in read-write mode, pointing the file pointer to the file header
5	a	Open by write, pointing the file pointer to the end of the file. If the file does not exist it tries to create[Additional document content]
6	a+	Opened in read-write mode, pointing the file pointer to the end of the file. If the file does not exist it tries to create
7	x	Creates and opens the file as a write, pointing the file pointer to the file header. If the file already exists, the file open fopen() call fails and returns FALSE with an E_WARNING level error message. If the file does not exist, an attempt is made to create
8	x+	Creates and opens a file as read-write, pointing the file pointer to the header. If the file already exists, the file open fopen() call fails and returns FALSE with an E_WARNING level error message. If the file does not exist, an attempt is made to create

PHP Temporary Files
Previously, we will write the contents of the file saved to disk are permanent files; and the creation of temporary files on our development is also useful (i.e.: build a temporary file, after use will be automatically deleted, we do not need to maintain the deletion status of this file). <?php header("Content-Type:text/html;charset=UTF-8"); //temporary files (windows system temporary files stored in [C:\Users\Username\AppData\Local\Temp directory] with php content is) //1. Create a temporary file $tmpfile=tmpfile(); //2. Writing to temporary files $writeInfoToTmpfile=fwrite($tmpfile,"Testing messages written to temporary files1"); echo "Temporary file write content 1 results:$writeInfoToTmpfile <br>"; $writeInfoToTmpfile2=fwrite($tmpfile,"Second Write Test Temporary File Information 2"); echo "Temporary file write content 2 results:$writeInfoToTmpfile2 <br>"; // // Hibernate for 15 seconds to make it easier for us to go to [C:\Users\Username\AppData\Local\Temp directory] to view the contents of the file // sleep(15); // // Read temporary file mode 1 // fseek($tmpfile,0); // rewind($tmpfile); // // Specify to read the contents of a 1K file. // $readTmpfileInfo=fread($tmpfile,1024); // // Close the temporary file (the file will be deleted as soon as it is closed) // fclose($tmpfile); //Read Temporary Files Mode II $tmpfile_path = stream_get_meta_data($tmpfile)['uri']; $readTmpfileInfo=file_get_contents($tmpfile_path); echo "Read the temporary file information as:$readTmpfileInfo <br>"; ?>

Previously, we will write the contents of the file saved to disk are permanent files; and the creation of temporary files on our development is also useful (i.e.: build a temporary file, after use will be automatically deleted, we do not need to maintain the deletion status of this file).




<?php




header("Content-Type:text/html;charset=UTF-8");



 



//temporary files (windows system temporary files stored in [C:\Users\Username\AppData\Local\Temp directory] with php content is)



//1. Create a temporary file




$tmpfile=tmpfile();



//2. Writing to temporary files




$writeInfoToTmpfile=fwrite($tmpfile,"Testing messages written to temporary files1");




echo "Temporary file write content 1 results:$writeInfoToTmpfile <br>";




$writeInfoToTmpfile2=fwrite($tmpfile,"Second Write Test Temporary File Information 2");




echo "Temporary file write content 2 results:$writeInfoToTmpfile2 <br>";



// // Hibernate for 15 seconds to make it easier for us to go to [C:\Users\Username\AppData\Local\Temp directory] to view the contents of the file



// sleep(15);



// // Read temporary file mode 1



// fseek($tmpfile,0);



// rewind($tmpfile);



// // Specify to read the contents of a 1K file.



// $readTmpfileInfo=fread($tmpfile,1024);



// // Close the temporary file (the file will be deleted as soon as it is closed)



// fclose($tmpfile);



 



//Read Temporary Files Mode II




$tmpfile_path = stream_get_meta_data($tmpfile)['uri'];




$readTmpfileInfo=file_get_contents($tmpfile_path);




echo "Read the temporary file information as:$readTmpfileInfo <br>";



 



?>

**Renaming, moving, copying and deleting PHP files**
serial number	Manipulation of documents	clarification
1	rename(original file path and name, original file path and new name)	Rename the file
2	rename(original file path and name, new file path and name)	Moves the file to the specified path and can change the name
3	copy(original file path and name, new file path and name))	Files can be copied to a specified path and names can be changed.
4	unlink(path and name of the file)	Delete the specified file

**PHP's common functions for file attributes**
serial number	Common Functions for File Attributes	clarification
1	bool file_exists ( $specifies the file name or file path)	Detecting the existence of a file
2	bool is_readable ( $specifies the file name or file path)	Detecting whether a file is readable
3	bool is_writeable ( $specifies the file name or file path)	Detecting whether a file is writable
4	bool is_executable ( $specifies the file name or file path)	Detecting whether a file is executable
5	bool is_file ( $specifies the file name or file path)	Detecting whether a file
6	void clearstatcache ( void )	Clearing the state cache of a file

**PHP file path function**
serial number	File Path Functions	clarification
1	pathinfo(path and name of the file)	Returns an associative array containing the path information. Whether an associative array or a string is returned depends on the`flags（`If specified, the specified elements will be returned; they include:`PATHINFO_DIRNAME`、 `PATHINFO_BASENAME`、 `PATHINFO_EXTENSION`、 `PATHINFO_FILENAME`。 If you don't specify the`flags` The default is to return all units. `）`
2	parse_url(url address)	Parses the URL and returnsassociative arraywhich contains the various components that appear in the URL. The values of the elements of the arraywill not (act, happen etc) URL Decoding PHP: parse_url - Manual
3	http_build_query()	Generate request string after URL-encoding PHP: http_build_query - Manual
4	http_build_url()	Generate a URL http_build_url - [ php Chinese Manual ] - Online Native Manuals




<html>



 



<head>



    <meta charset="UTF-8">



    <title> Testing common PHP functions </title>



</head>



 



<body>



<?php



 



// Specify the content type and encoding format of PHP pages




header("Content-Type:text/html; charset=utf-8");



 




$dateInfos=date('Y-m-d H:i:s');




$filePthAndName="../files/";



 



//file_put_contents will be written to the file (overwrite write, first empty the file in the write), if the file does not exist then create the file; the return result is the length of the file




$result=file_put_contents($filePthAndName,"$dateInfos This is the information about the contents of the test write file! \n This is the content of the second line \n This is the content of the third line ");




echo "[file_put_contents write content]$result";




echo "<br>";



 



//readfile returns the length of the read content, but after reading the file, it will display the contents of the file itself.




$fileinfo=readfile($filePthAndName);




echo "<br>";




echo "[readfile reads contents]$fileinfo <br>";



 



//file_get_contents returns the contents of the file being read




$fileinfo2=file_get_contents($filePthAndName);




echo "[file_get_contents reads the contents of a file]$fileinfo2 <br>";



 



//file_get_contents supports reading web url addresses (can be used with file_put_contents to download files, images, etc. for local storage)




$networkFilePathName="/wp-includes/js/jquery/";




$networkFile=file_get_contents($networkFilePathName);




echo "The contents of the network file read by [file_get_contents] are as follows:<br>$networkFile <br>";



 



//Save the document




$saveFilePathName="../files/";




$downloadFile=file_put_contents($saveFilePathName,$networkFile);




echo "<br> from [...$networkFilePathName ] to download the file and save it to [$saveFilePathName ] The length of the file is [$downloadFile 】 ";




echo "<br><br>";



 




echo "<br>";



//Document manipulation




$filePathname22='../files/';



 



//1. Opening of documents




$openFile=fopen($filePathname22,'w');



 



//2. Write to file (fwrite returns the length of the data written)




$writeFile=fwrite($openFile,"Hello, milk coffee \n the second line of content \n the third line of content");




echo "[fwrite write to file] Result:$writeFile <br>";



 



//3. Close the open file after writing it.




fclose($openFile);



 



 



//1. Opening of documents




$openFile2=fopen($filePathname22,'r');



//2, read the file way a [fread] need to specify the length of the file content to read, inconvenience




$readfile1=fread($openFile2,6);




echo "[fread reads the file]:$readfile1 <br>";



 



/ / 2, read the file way two [fgets] (call once to read a line of data)




$readFile2=fgets($openFile2);




echo "[fgets reads the file for the first time]:$readFile2 <br>";




$readFile2=fgets($openFile2);




echo "[fgets reads the file for the second time]:$readFile2 <br>";



 



//3. Remember to close the file to release resources after the file operation is completed.




fclose($openFile2);



 



 



//1. Opening of documents (by appending to the end of the document)




$openFile3=fopen($filePathname22,'a');



//2. Append content (return the length of the appended content after success)




$appendInfo=fwrite($openFile3,"This is a test addition.");




echo "Additional content results:$appendInfo <br>";



//3. Remember to close the file to release resources after the file operation is completed.




fclose($openFile3);



 



//1. Opening of documents




$openFile4=fopen('../files/','x');




$fileOpc=fwrite($openFile4,"--- Test additions aaa----");




echo "Add content results:$fileOpc <br><br><br>";




fclose($openFile4);



 



 



//temporary files (windows system temporary files stored in [C:\Users\Username\AppData\Local\Temp directory] with php content is)



//1. Create a temporary file




$tmpfile=tmpfile();



//2. Writing to temporary files




$writeInfoToTmpfile=fwrite($tmpfile,"Testing messages written to temporary files1");




echo "Temporary file write content 1 results:$writeInfoToTmpfile <br>";




$writeInfoToTmpfile2=fwrite($tmpfile,"Second Write Test Temporary File Information 2");




echo "Temporary file write content 2 results:$writeInfoToTmpfile2 <br>";



// // Hibernate for 15 seconds to make it easier for us to go to [C:\Users\User Name\AppData\Local\Temp directory] to view the contents of the file



// sleep(15);



// // Read temporary file mode 1



// fseek($tmpfile,0);



// rewind($tmpfile);



// // Specify to read the contents of a 1K file.



// $readTmpfileInfo=fread($tmpfile,1024);



// // Close the temporary file (the file will be deleted as soon as it is closed)



// fclose($tmpfile);



 



//Read Temporary Files Mode II




$tmpfile_path = stream_get_meta_data($tmpfile)['uri'];




$readTmpfileInfo=file_get_contents($tmpfile_path);




echo "Read the temporary file information as:$readTmpfileInfo <br>";



 



//Move copies and delete files



//1, use rename method if it is in the same path means rename (return result 1 means success, otherwise failure)




$renameresult=rename('./test/','./test/');




echo "The result after renaming the file:$renameresult <br>";



 



/ / 2, the use of rename method if it is in a different path, it is said to move the file and file rename (return result 1 indicates success, otherwise failed)




$renameresult2=rename('./test/','../test_2.php');




echo "The result of moving and renaming a file:$renameresult2 <br>";



 



//3. Reproduction of documents




$copyfileresult=copy("../test_2.php","./test/");




echo "The result after copying and renaming the file:$copyfileresult <br>";



 



//4. Deletion of documents




$delfileresult=unlink("../test_2.php");




echo "Results after deletion of files:$delfileresult <br><br>";



 



//5. Getting information about file paths




$curfilepath22=__FILE__;




$filepathinfo=pathinfo($curfilepath22);




echo "[$curfilepath22The message of] is: <br>";




print_r ($filepathinfo);




echo '<br>';




echo"File path:".$filepathinfo['dirname'].'<br>';




echo"File name:".$filepathinfo['basename'].'<br>';




echo"File extension:".$filepathinfo['extension'].'<br>';




echo"File name without file extension:".$filepathinfo['filename'].'<br>';



 



?>



 



</body>



 



</html>

Contents of the provisional document

1.3 PHP file permission settings

Linux system file permissions in detail_linux file permissions/xiaochenXIHUA/article/details/139974153?spm=1001.2014.3001.5501

existLinuxsystem, PHP can use the chmod function to set permissions as follows:




<?php



// Modify the file permissions of /var/log/nginx/ on linux systems to 755.




chmod("/var/log/nginx/", 755);




chmod("/var/log/nginx/", "u+rwx,go+rx");



//Modify directory permissions to 755




chmod("/var/log/nginx", 0755);



?>

Second, PHP file transfer operations

2.1 PHP configuration for file uploading

Use PHP for file uploads need to [] configuration file operation (that is: will [file_uploads = On] uncommented and enabled); modification is completed to save the configuration file and the need to restart the PHP service will take effect.

**PHP upload file common configuration items**
serial number	Common configuration items for uploading files	clarification
1	file_uploads	on means enable the file upload function, off means disable the file upload function.
2	max_file_uploads	Maximum number of files allowed to be uploaded (can be modified according to your project needs)
3	upload_max_filesize	Maximum allowed upload file size (default is 2M) (can be modified according to your project needs)
4	post_max_size	Maximum value that can be received by PHP through the form POST method (default is 8M) (can be modified according to your project needs)
5	upload_tmp_dir	Directory where temporary files are stored (default is C:\Users\User Name\AppData\Local\Temp)
If you need to upload large files, you will also need to set the following three configuration items
1	max_execution_time	Maximum time value for each PHP script page to run (in seconds; default 30 seconds)
2	max_input_time	Maximum time required for each PHP script page to receive data (in seconds; default 60 seconds)
3	memory_limit	Maximum memory per PHP script page limit (default: 128M)
Note: PHP in the [ ] configuration file after any content modification, you need to restart the PHP service before it takes effect Suggested parameters: upload_max_filesize < upload_max_filesize < post_max_size < memory_limit

Alternatively, you can use the [phpiP interest rate].




<?php



 phpinfo(); 



?>

2.2. Idea and realization of file uploading

1、User operation

1. Select the document;

2. Submission of documents;

2、Upload file process ideas

1、Get to the submitted file (recommended to use the POST method to receive);

2. Determine the size of the file (determine whether the file is out of range);

3, determine the file type (get the file type and determine whether it meets the requirements);

4. Generate a new file name (because the use of the original name may have some sensitive violations of laws and regulations; or easy to be utilized by hackers);

6. Move the temporary file to the specified path for permanent storage;

The following is the realization of a simple netbook function code content:

1, create a new page named [ ], for file upload, content display, the code is as follows:




<!DOCTYPE>



<html>



    <head>



        <meta charset="utf-8">



        <title> small netbook</title>



    </head>



    <body>



 



    <form method="post">



        <input type="submit"  name="delBtn" value="Delete">



        <input type="submit" name="moveBtn" value="Move.">



        <input type="submit" name="copyBtn" value="Copy.">



    </form>



 



    <form method='post'><input type='submit' name='delBtn' value='Delete'><input type='submit' name='moveBtn' value='Move'><input type='submit' name='copyBtn' value='Copy'></form>



    <hr>



    <form action="../php/" method="post" enctype="multipart/form-data">



         <p style="font-size: 36px; color: orange;" > Example of uploading a file </p>



         <div border="3">



            <input type="file" name="uploadfile">



            <input type="submit" name="Submit">



         </div>



    </form>



    <hr>



 



   <?php




    header("Content-Type:text/html;charset=utf-8");



 



    $rootPath=$_SERVER['DOCUMENT_ROOT'];



    echo "The project root directory is [$rootPath 】 <br>";



    $uploadFilePath=$rootPath."/files/uploadfiles";



    echo "The path to the uploaded file is [$uploadFilePath 】<br>";



    $uploadFileAllFile=scandir($uploadFilePath);



    showdir($uploadFileAllFile,$uploadFilePath);



 



    function showdir(array $curDirAllFiles,$curPath)




    {



        foreach($curDirAllFiles as $key => $value){



            // Filtering . and . Do not show




            if ($value=='.'||$value=='..'){



                echo "<a href='./?fullpathname=$curPath'>$value</a> <br>";



                continue;



            }



 



            $fullPath=$curPath."/".$value;



            $value=iconv('gbk','utf-8',$value);



            if(is_dir($fullPath)){



                $fullpath2=$fullPath.'/'.$value;



                // echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value</a> &nbsp;<a href='./?delCurFile=$fullPath'>removing</a> <a href='./?moveCurFile=$fullPath'>mobility</a> <a href='./?copyCurFile=$fullPath'>make a copy of</a><br>";




                echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value<br>";



            }



            else{



                echo "<img src='. /images/files.png' width='20px' height='20px'/>$value &nbsp;<a href='./?delCurFile=$fullPath' > delete </a> <a href='. /?moveCurFile=$fullPath' > mobile </a> <a href='. /?copyCurFile=$fullPath'>copy</a><br>";



            }



 



        }



    }



 



    // echo "<script>var v=( 'Are you sure you want to delete this record? ');




    //  ='res=' + v;




    // </script>";




    //  $res=$_COOKIE['res'];




    // echo "Selection result of the popup window: $res";




 



 



   



    if(isset($_POST["delBtn"])) {



        echo "You clicked the delete button <br>";



    }



   



    if(isset($_POST["moveBtn"])) {



        echo "You clicked the move button <br>";



    }



   



    if(isset($_POST["copyBtn"])) {



        echo "You clicked the copy button <br>";



    }



 



   ?>




    </body>



</html>

2, and then create a new interface named [ ] for the directory and file display and switching, the code is as follows:




<?php




header("Content-Type:text/html;charset=UTF-8");



 




$fullpathname =$_GET['fullpathname'];



 




$curpath=dirname($fullpathname);




$curdirallfiles=scandir($curpath);




showdir($curdirallfiles,$curpath);



 



function showdir(array $curDirAllFiles,$curPath)



{



    foreach($curDirAllFiles as $key => $value){



        // Filtering . and . as operations that return to the previous level




        if ($value=='.'||$value=='..'){



            echo "<a href='./?fullpathname=$curPath'>$value</a> <br>";



            continue;



        }



 



        $value=iconv('gbk','utf-8',$value);



        $fullPath=$curPath."/".$value;



        // $value=iconv('gbk','utf-8',$value);




        if(is_dir($fullPath)){



            $fullpath2=$fullPath.'/'.$value;



            //Display directory icons and directory names (and directories can be clicked on to see the contents of the files and folders they contain)




            // echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value</a> &nbsp;<a href='./?delCurFile=$fullPath'>removing</a> <a href='./?moveCurFile=$fullPath'>mobility</a> <a href='./?copyCurFile=$fullPath'>make a copy of</a><br>";




            echo "<img src='../images/catalogs.png' width='20px' height='20px'/> <a href='./?fullpathname=$fullpath2'> $value</a> <br>";



        }



        else{



            //Display file icons and file names (and can delete, move, copy files)




            echo "<img src='. /images/files.png' width='20px' height='20px'/>$value &nbsp;<a href='./?delCurFile=$fullPath' > delete </a> <a href='. /?moveCurFile=$fullPath' > mobile </a> <a href='. /?copyCurFile=$fullPath'>copy</a><br>";



            // echo "<img src='../images/file.png' width='20px' height='20px'/> $value <br>";




        }



 



    }



}



 



?>

3, and finally a new interface named [ ] for the deletion of files, move and copy operations, the code is as follows:




    <?php




    header("Content-Type:text/html;charset=utf-8");



 



    echo "<a style='font-size:36px;color:blue' href='. /'>Return to home page</a> <br>";



 



    // Deletion of documents




    $delCurFile =$_GET['delCurFile'];



    echo "[Access to documents to be deleted]$delCurFile <br>";



    // Get the name of the document




    $filename = pathinfo($delCurFile,PATHINFO_BASENAME);



 



    if(file_exists($delCurFile)){



        echo "[Preparation for deletion of documents]$delCurFile <br>";



        $filePathInfo=pathinfo($delCurFile);



        $result = unlink($delCurFile);



        echo "Delete file [".$filePathInfo['basename']."] the result is:";



        if($result){



            echo "<p style='font-size:36px;color:green'>Deleted successfully</P> <br>";



        }else{



            echo "<p style='font-size:36px;color:red'>Delete failed</P> <br>";



        }



    }



    



 



    //Movement of documents




    $moveCurFile =$_GET['moveCurFile'];



    echo "[Access to documents to be moved]$moveCurFile <br>";



    if(file_exists($moveCurFile)){



        echo "[Preparing to move documents]$moveCurFile <br>";



        //Get the contents of the document




        $filePath=pathinfo($moveCurFile,PATHINFO_DIRNAME);



        echo "Path to the file to be moved:$filePath <br>";



        //Get the name of the file and the name of the extension




        $fileNameExtension=pathinfo($moveCurFile,PATHINFO_BASENAME);



        echo "The path and extension name of the file to be moved:$fileNameExtension <br>";



 



        //New file path and name




        $newFilePathName=$filePath.'/test/'.$fileNameExtension;



        echo "New file path and name:$newFilePathName <br>";



 



        $result=rename($moveCurFile, $newFilePathName);



 



        if($result){



            echo "<p style='font-size:36px;color:green'> The move was successful and the path after the move is: test/.$fileNameExtension</P> <br>";



        }



        else{



            echo "<p style='font-size:36px;color:red'> move failed</P> <br>";



        }



 



    } 



 



    //Copying of documents




    $copyCurFile =$_GET['copyCurFile'];



    echo "[Document to be copied is obtained.]$copyCurFile <br>";



    if(file_exists($copyCurFile)){



        echo "[Preparation of documents for reproduction]$copyCurFile <br>";



        //Get the contents of the document




        $filePath=pathinfo($copyCurFile,PATHINFO_DIRNAME);



        echo "Path to the file to be copied:$filePath <br>";



        $fileName = pathinfo($copyCurFile,PATHINFO_FILENAME);



        echo "The name of the file to be copied:$fileName <br>";



        $fileExtension = pathinfo($copyCurFile,PATHINFO_EXTENSION);



        echo "The extension name of the file to be copied:$fileExtension <br>";



        $newFilePathName=$filePath."/".$fileName."(1).".$fileExtension;



        echo "The name of the copied file is:$newFilePathName <br>";



        



        $result=copy($copyCurFile,$newFilePathName);



        echo "[Reproduction of results]$result";



        if($result){



            echo "<p style='font-size:36px;color:green'> The copy was successful and the name of the copied file is:$newFilePathName</P> <br>";



        }



        else{



            echo "<p style='font-size:36px;color:red'> copy failed</P> <br>";



        }



    }



 



   



?>

Third, PHP's other operations

3.1 Functions in PHP that can execute system commands

**Functions in PHP that can execute system commands**
serial number	Functions that can execute system commands	clarification
1	exec	Execution of an external program PHP: exec - Manual
2	system(command)	Execute an external program and display the output (recommended) PHP: system - Manual




<?php




header("Content-Type:text/html;charset=GB2312");



 



//View system IP information content command




$cmd="ipconfig";



//View System Configuration Information Command for PHP




$cmd=phpinfo();



//Execute the [ipconfig] system command and save the result to a file.




$cmd="ipconfig > ../files/";



 




$cmdResult=system($cmd);




echo "<br>";



// $convertcmdResult=iconv("gbk","utf-8",$cmdResult);



// $convertcmdResult=mb_convert_encoding($cmdResult,"utf-8","gb2312");




echo "$cmdResult <br>";



 



 



//  $cmdResult2=exec($cmd);



// $convertcmdResult=mb_convert_encoding($cmdResult2,"utf-8","gbk");



// echo "Result after exec command [$cmd 】： $convertcmdResult <br>";";



 



?>

3.2 Error Handling in PHP

As we write the code can not guarantee that there are no bugs and errors, then there are only these exceptions and errors, if you do not set up these exceptions and errors to capture the processing; then these exceptions and errors will be displayed in front of the user, which will lead to the server's sensitive information leaked out, not conducive to the security of the system and the server (we hope that the exceptions and errors will not be displayed to the user, but simply (we hope that the exception and error information will not be shown to the user, but only recorded for internal development and operation and maintenance personnel to use).

**PHP Error Types**
serial number	PHP Error Types	clarification
1	E_ERROR	Error type, the file code is directly interrupted and no longer executed (the most serious, must be resolved)
2	E_WARNING	Warning type, more serious problem; code will continue to run down the line (also serious, must be fixed)
3	E_NOTICE	Tip type, some small problems will not affect the operation of the program (often occurs in the project code is not defined in the case) (you can not care, but NOTICE type error will affect the efficiency of the execution of PHP) (depending on company requirements)
4	E_PARSE	Compile-time syntax parsing error type; parsing errors are generated only by the parser (parse errors, which are syntax misspellings, must be resolved)
5	E_ALL	All errors and warnings
6	E_STRICT	Enable PHP suggestions for code changes to ensure optimal interoperability and forward compatibility of code
7	E_DEPRECATED	Enabling this will give warnings about code that may not work properly in future releases
PHP: Error Handling - Manual PHP Error Handling

PHP in the [] configuration item [display_errors] is to control whether the error message output to the web page display. In the production environment this configuration must be turned off to display errors, only when the development can be opened for debugging use.

**Misconfiguration of configuration files in PHP**
serial number	Misconfiguration of configuration files in PHP	clarification
1	display_errors = On	Controls whether error messages for the entire PHP environment are displayed on the interface [on means display; off means off]. PHP: Runtime Configuration - Manual
2	error_reporting = E_ALL	Controls whether errors sent by the PHP engine are displayed, output, and logged. 1. error_reporting = E_ALL (indicating that all errors are displayed); 2、error_reporting = E_ALL & ~ E_NOTICE (means show all errors but exclude hints); 3. error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED (indicates that all errors are displayed, but excludes hints, compatibility and future compatibility); 】
Error Logging Configuration (Everything that has been done in [ ] needs to be restarted for the PHP service to take effect)
1	log_errors	Whether to enable logging (on for on, off for off) PHP: Runtime Configuration - Manual
2	log_errors_max_len	Maximum record length for single line errors (default: 1024 bytes)
3	error_log	Where the error log is recorded (you can specify either syslog or a path; where syslog means system logging[)windowsThe system is in the computer's event viewer - application logs. linux defaults to: /etc/.) PHP: Runtime Configuration - Manual

Serial number does not have server PHP configuration file modification permissions to handle the error method

No modification of server PHP configuration file permissions handling error method
Serial number does not have server PHP configuration file modification permissions to handle the error method
<?php header("Content-Type:text/html;charset=utf-8"); //Modify the error status of the server [this sets whether to output error messages to the web page for display, this setting must be turned off for production environments]. //(scope is limited to the current PHP code file, generally used for code start enable) ini_set("display_errors",0); $display_errors0=ini_get("display_errors"); echo "0-The current error status displayed in the server is:$display_errors0 <br>"; // // Close all errors // error_reporting(0); // // Display all errors // error_reporting(E_ALL); //Display all errors without alerts error_reporting(E_ALL & ~ E_NOTICE); $tmp=$_GET['info']; echo "$tmp <br"; $display_errors=ini_get("display_errors"); echo "1-The error status currently displayed in the server is:$display_errors <br>"; ?> <?php /* Error Message Type Description 0 Send to default error_log location 1 Send to a specified mail location 3 Send to a specified file location */ // Unable to connect to the Mysql database server, logged directly to the location specified in error_log. error_log("Unable to connect to Mysql database server server"); //Can send mail, but must have mail system configured. error_log('Errors can be reported by email so that operations and maintenance staff can receive alerts in time to deal with them',1 ,'ptest@'); // Recorded in the specified location error_log("This is an error message.", 3, "d:/test/"); ?>




<?php



    header("Content-Type:text/html;charset=utf-8");



    //Modify the error status of the server [this sets whether to output error messages to the web page for display, this setting must be turned off for production environments].




    //(scope is limited to the current PHP code file, generally used for code start enable)




    ini_set("display_errors",0);



    $display_errors0=ini_get("display_errors");



    echo "0-The current error status displayed in the server is:$display_errors0 <br>";



 



    // // Close all errors




    // error_reporting(0);




 



    // // Display all errors




    // error_reporting(E_ALL);




 



    //Display all errors without alerts




    error_reporting(E_ALL & ~ E_NOTICE);



 



    $tmp=$_GET['info'];



    echo "$tmp <br";



 



    $display_errors=ini_get("display_errors");



    echo "1-The error status currently displayed in the server is:$display_errors <br>";



 



?>




<?php



 



    /* Error Message Type Description




        0 Send to default error_log location



        1 Send to a specified mail location



        3 Send to a specified file location



    */



 



    // Unable to connect to the Mysql database server, logged directly to the location specified in error_log.




    error_log("Unable to connect to Mysql database server server");



    //Can send mail, but must have mail system configured.




    error_log('Errors can be reported by email so that operations and maintenance staff can receive alerts in time to deal with them',1 ,'ptest@');



    // Recorded in the specified location




    error_log("This is an error message.", 3, "d:/test/");



?>

3.3 Serialization and Deserialization in PHP

PHP: serialize - Manual /manual/zh/PHP: class_uses - Manual /manual/zh/PHP: Manual Quick Referencehttps:///?pattern=class&scope=quickrefPHP: unserialize - Manual /manual/zh/




<?php




header("Content-Type:text/html;charset=utf-8");



    // Create a human information object




    class peopleInfo{



        var $name;  // Define the name attribute




        var $sex;   // Define the gender attribute




        var $age;   



 



        // // Constructor




        // function __construct() {




 



        // }




 



        // Define a constructor (to accept incoming information)




        function peopleInfo($name,$sex,$age){



            $this->name = $name;



            $this->sex = $sex;



            $this->age= $age;;



        }



 



        //Printing information




        function printInfo() {



            echo "My name is:".$this->name." Gender is: ".$this->sex." Age is: ".$this->age."<br>";



        }



 



        //Special methods for automatic destruction of objects (memory reclamation)




        function __destruct(){



            echo "Object has been destroyed <br>";



            echo  phpinfo();



        }



 



 



    }



 



    // Use of human information objects




    $peopleInfo=new peopleInfo("Coffee with milk.","Male.","26");



    // Call the print method of the human information object




    $peopleInfo->printInfo();



    // Specify the content of the attributes of the human information object separately




    $peopleInfo->name = "Choucie.";



    $peopleInfo->sex = "Female.";



    $peopleInfo->age = "27";



    $peopleInfo->printInfo();



 



    echo gettype($peopleInfo);



 



    echo "<hr>";



 



 



    // Serialize arrays




    $tmpArray=array('Milk coffee','Zhou Xi','Yang Xinyi');



    $tmpSerialize=serialize($tmpArray);



    echo "The string after serializing the array is:$tmpSerialize <br><hr>";



    // Deserialize array strings




    $tmpUnserialize=unserialize($tmpSerialize);



    echo "<br> deserialized string [$tmpSerialize The] post-data type is:".gettype($tmpUnserialize)." reads: ".$tmpUnserialize[0].$tmpUnserialize[1].$tmpUnserialize[2]."<br><hr>";



 



 



    //Serialize class objects




    $tmpClassObj=new peopleInfo("Yang Xinyi","Female.","26");



    $tmpClassObjSerialize=serialize($tmpClassObj);



    echo "The string after serializing the class object is:$tmpClassObjSerialize <br><hr> ";



    // Deserialize strings of class objects




    $tmpClassObjUnserialize=unserialize($tmpClassObjSerialize);



    echo "<br> deserialized string [$tmpClassObjSerialize The] post-data type is:".gettype($tmpClassObjSerialize)."<br>";



    //Calls the contents of the deserialized class object method




    $tmpClassObjUnserialize->printInfo();



    $tmpClassObjUnserialize->__destruct();



 



 



?>

The results are as follows.

3.4. Operation in PHPMysql database

PHP: Mysql (raw) - Manual /manual/zh/PHP: mysql_connect - Manual /manual/zh/PHP: mysql_query - Manual /manual/zh/




<?php




header("Content-Type:text/html;charset=utf-8");



 



//Simulate incoming username and password to database query




$usr=$_GET['usr'];




$pwd=$_GET['pwd'];




echo "The username obtained is [$usr The password is [$pwd 】<br><hr>";



 



// Link to mysql database




$mysqlDB=mysqli_connect("127.0.0.1","root","root","coffeemilk",3306);



//query sql




$sql="select * from user where username='$usr' and password='$pwd';";




$sqlresult = mysqli_query($mysqlDB,$sql);




var_dump($sqlresult);




$sqlRownum=$sqlresult->num_rows;




if($sqlRownum == 1) {



    echo "<p style='font-size:26px;color:green;'>Congratulations, login successful! </p>";



}




else {



    echo "<p style='font-size:26px;color:red;'> Unfortunately, login failed! </p>";



}



 




echo "<hr> implementation$sql The result of the query is: <br>";



 




while($row = mysqli_fetch_array($sqlresult)) {



    echo "User ID:".$row["id"]." Username:".$row["username"]." Password:".$row['password']." Created on:".$row["reg_time"]."<br><hr>";



 



}



 



//Insert sql




$sqlInsert="insert into user(username,password,reg_time)value('zhangsan','987654',current_timestamp())";




$sqlInsertResult=mysqli_query($mysqlDB,$sqlInsert);




echo "Execution [$sqlInsert The result of the] insert statement is:$sqlInsertResult <br>";




if ($sqlInsertResult==1) {



    echo "<p style='font-size:26px;color:green;'>Congratulations, inserted data successfully! </p>";



}else{



    echo "<p style='font-size:26px;color:red;'> Unfortunately, inserting the data failed! </p>";



}



 



//Finally close the Mysql database link




mysqli_close($mysqlDB);



 



 



?>

3.5. cookies andsession

PHP: setcookie - Manual /manual/zh/PHP: $_COOKIE - Manual /manual/zh/PHP: Sessions - Manual /manual/zh/PHP: Introduction - Manual /manual/zh/




<?php



 



    //1, set cookie (content is displayed in plaintext, not secure)




    setcookie("usr",$usr);



    setcookie("loginStatus",1);



    



    //2, get cookie information (content is displayed in plaintext, not secure)




    $usr=$_COOKIE['usr'];



    $loginStatus=$_COOKIE['loginStatus'];



 



?>




<?php



 



    //1, set session (a token data)




    session_start();



    $_SESSION['usr']=$usr;



    $_SESSION['loginTime']=time();



    $_SESSION['loginStatus']=1;



 



    //2, get the session information (a token data)




    session_start();



    $usr=isset($_SESSION['usr']);



    $loginStatus=isset($_SESSION['loginStatus']);



 



?>

(The href attribute is a readable and writable string that sets or returns the full URL of the currently displayed document)

1, a new commodity home page named [ ] code is as follows:




<!DOCTYPE html>



<html>



    <head>



        <meta charset="UTF-8">



        <title> Test Cookie for Product Home</title>



    </head>



 



    <body>



        <div>



            <?php




            header("Content-Type:text/html;charset=utf-8");



            //Set this page not to display error messages




            ini_set("display_errors",0);



        



            // // 1. Getting the cookie information (the content is displayed in plaintext, which is not secure)




            // $usr=$_COOKIE['usr'];




            // $loginStatus=$_COOKIE['loginStatus'];




 



            //2, get the session information (a token data)




            session_start();



            $usr=isset($_SESSION['usr']);



            $loginStatus=isset($_SESSION['loginStatus']);



 



            if($loginStatus!=1){



                echo "<a href='. /'>login</a>";



            }



 



            ?>




 



            <hr>



            <div style="font-size:36px;color:orange">



                Below is the listing information for the various businesses



            </div>



        </div>



 



    </body>



 



</html>

2, a new login interface named [ ] code is as follows:




<!DOCTYPE html>



<html>



    <head>




        <meta charset="UTF-8">




        <title>login screen</title>




    </head>




 



    <body>




        <div>




            <form action="./" method="post">




                <p style="font-size: 36px; color: chocolate;">Welcome to the login screen</p>




                <div>Username:<input type="text" name="usr"></div>




                <div>Password:<input type="password" name="pwd"></div>




                <input type="submit" name="Submit">




            </form>




        </div>




 



    </body>




 



</html>

3, a new database connection verification page named [ ] code is as follows:




<?php




header("Content-Type:text/html;charset=utf-8");



 



//Simulate incoming username and password to database query




$usr=$_POST['usr'];




$pwd=$_POST['pwd'];




echo "The username obtained is [$usr The password is [$pwd 】<br><hr>";



 



// Link to mysql database




$mysqlDB=mysqli_connect("127.0.0.1","root","root","coffeemilk",3306);



//query sql




$sql="select * from user where username='$usr' and password='$pwd';";




$sqlresult = mysqli_query($mysqlDB,$sql);




var_dump($sqlresult);




$sqlRownum=$sqlresult->num_rows;




if($sqlRownum == 1) {



    echo "<p style='font-size:26px;color:green;'>Congratulations, login successful! </p>";



    // //1. Setting cookies (content is displayed in plaintext, not secure)




    // setcookie("usr",$usr);




    // setcookie("loginStatus",1);




 



    //2, set session (a token data)




    session_start();



    $_SESSION['usr']=$usr;



    $_SESSION['loginTime']=time();



    $_SESSION['loginStatus']=1;



 



    echo "Automatically return to home page <script>='. /'</script>";



}




else {



    echo "<p style='font-size:26px;color:red;'>'Unfortunately, login failed! Please log in again'</p>";



    echo "<script>alert('Unfortunately, login failed! Please log in again'); ='. /'</script>";



}



 



//Finally close the Mysql database link




mysqli_close($mysqlDB);



 



 



?>

Introduction to the technical content involved in web development - back-end PHP (2)