- var_dump: documentation ( source)
- preg_replace_callback: documentation ( source)
<?php
$imgStr = '<img src="http://ww2.sinaimg.cn/bmiddle/a3d444e3jw1ez79amvdi1j20l50s8gpl.jpg"/>';
$imgStr = preg_replace_callback('#<img([^>]+?)src=[\'"]?([^\'"\s>]+)[\'"]?([^>]*)>#',function($match) {var_dump($match);},$imgStr);