PHP customizes dir(), readdir() functions to traverse all files in a directory_PHP tutorial

PHP custom traverses all files in the directory dir(), readdir() function

Method 1: Use dir() to traverse the directory

The dir() function returns a Directory class instance when successful

PHP dir() syntax format is:

　dir(directory);//directory is the name of the directory where the file name needs to be displayed, and can contain path information

PHP dir() Usage example: List all file names in the upload directory:

代码如下
$dir = @ dir("upload");//打开upload目录；“@”可屏蔽错误信息，因有时候需要显示文件的目录内并没有文件，此时可能会报出错误，用“@”隐藏掉错误 //列举upload目录中的所有文件 while (($file = $dir->read()) !== false) {   echo "文件名: " . $file . " "; } $dir->close(); ?>

The output result is:

File name: .

File name: ..

File name: logo.gif

File name: arrow.gif

File name: bg.gif

Example

代码如下

function tree($dir) {     $mydir = dir($dir);     while($file = $mydir->read())     {         if($file != '.' && $file != '..')         {             if(is_dir("$dir/$file"))             {                 echo '目录名：'.$dir.DIRECTORY_SEPARATOR.''.$file.' ';                 tree("$dir/$file");             }else{                 echo '文件名：'.$dir.DIRECTORY_SEPARATOR.$file.' ';             }         }     }     $mydir->close(); } tree('./phpmyadmin');

Method 2 Use readir() to traverse the directory

Definition and usage

The readdir() function returns the entry in the directory handle opened by opendir().

If successful, the function returns a file name, otherwise it returns false.

Grammar

readdir(dir_stream)

Example

代码如下

header('content-type:text/html;charset=utf-8'); function listDir($dir) {     if(is_dir($dir))     {         if($handle = opendir($dir))         {             while($file = readdir($handle))             {                 if($file != '.' && $file != '..')                 {                     if(is_dir($dir.DIRECTORY_SEPARATOR.$file))                     {                         echo '目录名：'.$dir.DIRECTORY_SEPARATOR.''.$file.' ';                         listDir($dir.DIRECTORY_SEPARATOR.$file);                     }else{                         echo '文件名：'.$dir.DIRECTORY_SEPARATOR.$file.' ';                     }                 }             }         }         closedir($handle);     }else{         echo '非有效目录!';     } } listDir('./phpmyadmin');

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