本文实例讲述了 php 从文件夹随机读取文件的方法分享给大家供大家参考具体实现方法如下:
- 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
来源: https://www.php1.cn/detail/php-522ac076cb.html