php uses spl library to traverse files

Example code:

<?php class ExtentionFinder extends FilterIterator
	{
		public $predicate, $path;
		public function __construct($path, $predicate)
		{
			$this->predicate = $predicate;
			$this->path = $path;

			$it = new RecursiveDirectoryIterator($path);
			$flatIterator = new RecursiveIteratorIterator($it);

			parent::__construct($flatIterator);
		}

		public function accept()
		{
			$pathInfo = pathinfo($this->current());
			$extension = $pathInfo['extension'];

			return ($extension == $this->predicate);
		}
	}
?>
<?php $it = new ExtentionFinder(&#39;./&#39;, &#39;php&#39;);
	foreach($it as $value)
	{
		echo $value."<br/>";
	}
?>

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The above introduces how PHP uses the spl library to traverse files, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.