1. class a{     
2.  private $img_dir; 
3.         private $img_path; 
4.         private $face_files = array(); 
5.         private $allow_extension = array(); 
6. private function get_face_files() 
7.         { 
8.             $files = array(); 
9.             if(is_dir($this->img_dir)) 
10.             { 
11.                 if ($dh = opendir($this->img_dir)) 
12.                 { 
13.                     while (($file = readdir($dh)) !== false) 
14.                     { 
15.                         if($file == '.') continue; 
16.                         if($file == '..') continue; 
17.                         $fileinfo = explode('.', (basename($file))); 
18.                         if(in_array($fileinfo[1], $this->allow_extension)) 
19.                         {//开源代码phpfensi.com 
20.                             $files[] = array( 
21.                                 'filename' => $fileinfo[0], 
22.                                 'extension' => $fileinfo[1], 
23.                             ); 
24.                         } 
25.                     } 
26.                     closedir($dh); 
27.                 } 
28.             } 
29.             return $files; 
30.         } 
31. } 
32.  

出处：http://www.phpfensi.com/php/20140908/5051.html