PHP custom Traverse directory All Files dir (), Readdir () function _php Tutorial

PHP custom Traverse directory All Files dir (), Readdir () function

Method One: Use Dir () to traverse the directory

Dir () function, returns the Directory class instance when successful

The syntax format for the PHP dir () is:

Dir (directory);//directory is a directory name that needs to display the file name, which can contain path information

PHP dir () Usage example: Lists all filenames under the upload directory:

The code is as follows
$dir = @ Dir ("upload");//open upload directory; "@" to block error messages, because sometimes there is no file in the directory where the files need to be displayed, you may report an error and hide the error with "@" Enumerate all files in the upload directory while (($file = $dir->read ())!== false) { echo "File name:". $file. " "; } $dir->close (); ?>

The output is:

Filename:.

Filename:..

File name: logo.gif

File name: arrow.gif

File name: bg.gif

Example

The code is as follows
function tree ($dir) { $mydir = Dir ($dir); while ($file = $mydir->read ()) { if ($file! = '. ' && $file! = ' ... ') { if (Is_dir ("$dir/$file")) { Echo ' Directory name: '. $dir. Directory_separator. " $file. ' '; Tree ("$dir/$file"); }else{ echo ' filename: '. $dir. Directory_separator. $file. ' '; } } } $mydir->close (); } Tree ('./phpmyadmin ');

Method two uses Readir () to traverse the directory

Definition and usage

The Readdir () function returns an entry in a directory handle opened by Opendir ().

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

Grammar

Readdir (Dir_stream)

Example

The code is as follows

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 ' Directory name: '. $dir. Directory_separator. " $file. ' '; Listdir ($dir. Directory_separator. $file); }else{ echo ' filename: '. $dir. Directory_separator. $file. ' '; } } } } Closedir ($handle); }else{ echo ' Non-valid catalog! '; } } Listdir ('./phpmyadmin ');

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