How to read random files from a folder in php_PHP tutorial-PHP Tutorial-php.cn

How to read random files from a folder in php_PHP tutorial

WBOY

Release： 2016-07-13 09:52:09

Original

901 people have browsed it

How to randomly read files from a folder in php

The example in this article describes how to randomly read files in php from a folder. Share it with everyone for your reference. The specific implementation method is as follows:

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 was not found! very strange!');

}

// return the random file:

return $folder . $files[$rand];

}

//用法演示：

// "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

2 3

13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

I hope this article will be helpful to everyone’s PHP programming design. http://www.bkjia.com/PHPjc/1009821.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1009821.htmlTechArticleHow to randomly read files from a folder in php. This article describes how to randomly read files in php from a folder. . Share it with everyone for your reference. The specific implementation method is as follows: ? 1 2 3 4...