PHP Random read files from a folder _php tutorial

Source: Internet
Author: User

How PHP randomly reads files from a folder


The example in this article describes how PHP randomly reads files from a folder. Share to everyone for your reference. The implementation method is as follows:

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function Randomfile ($folder = ', $extensions = '. * ') {

Fix path:

$folder = Trim ($folder);

$folder = ($folder = = ")? './': $folder;

Check folder:

if (!is_dir ($folder)) {die (' Invalid folder given! ');}

Create files Array

$files = Array ();

Open Directory

if ($dir = @opendir ($folder)) {

Go trough All Files:

while ($file = Readdir ($dir)) {

if (!preg_match ('/^\.+$/', $file) and

Preg_match ('/\. $extensions. ') $/', $file)) {

Feed the array:

$files [] = $file;

}

}

Close Directory

Closedir ($dir);

}

else {

Die (' Could not open the folder '. $folder. ');

}

if (count ($files) = = 0) {

Die (' No files where found:-(');

}

Seed random function:

Mt_srand (Double) microtime () *1000000);

Get an random index:

$rand = Mt_rand (0, Count ($files)-1);

Check again:

if (!isset ($files [$rand])) {

Die (' Array index is not found! very strange! ');

}

Return the random file:

Return $folder. $files [$rand];

}

Usage Demo:

"Jpg|png|gif" matches all files with these extensions

Print randomfile (' test_images/', ' jpg|png|gif ');

Returns test_07.gif

". *" matches all extensions (all files)

Print randomfile (' test_files/', '. * ');

Returns Foobar_1.zip

"[0-9]+" matches all extensions that just

Contain numbers (like BACKUP.1, BACKUP.2)

Print randomfile (' test_files/', ' [0-9]+ ');

Returns BACKUP.7

I hope this article is helpful to everyone's PHP programming.

http://www.bkjia.com/PHPjc/1009821.html www.bkjia.com true http://www.bkjia.com/PHPjc/1009821.html techarticle php Random read files from a folder The example in this article describes how PHP randomly reads files from a folder. Share to everyone for your reference. The specific implementation method is as follows:? 1 2 3 4 ...

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