$files ='<img src="http://img.phprm.com/img/bid_v2/bid_v2_content/p_bid.gif" alt="普通任务" /><img width="272px" height="60px" style="padding-top: 10px;" src="http://img.imgzhubajie.com/img/index_v3/20100611001.gif">';
// 图片地址转换一下   $p=preg_replace('//image//', 'http://qq.ip138.com/image/', $pg[1]);
 $reg = "/<img[^>]*src="(http://(.+)/(.+).(jpg|gif|bmp|bnp))"/isu";
$img=preg_match_all($reg,$files,$imgs);

for ($i=0;$i<count($imgs[0]);$i++)
{

//echo "".$imgs[1][$i]." <br> ";
//保存图片
$opts = array(
  'http'=>array(
    'header'=>"referer: http://www.phprm.com/ "
  )
);
}