解析PHP SPL标准库的用法(遍历目录,查找固定条件的文件)

 class RecursiveFileFilterIterator extends FilterIterator {
     // 满足条件的扩展名
     protected $ext = array('jpg','gif');

    
     public function __construct($path) {
         parent::__construct(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)));
     }

    
     public function accept() {
         $item = $this->getInnerIterator();
         if ($item->isFile() && 
                 in_array(pathinfo($item->getFilename(), PATHINFO_EXTENSION), $this->ext)) {
             return TRUE;
         }
     }
 }

 // 实例化
 foreach (new RecursiveFileFilterIterator('D:/history') as $item) {
     echo $item . PHP_EOL;
 }