php 图片地址处理

//图片地址处理
function Getpics($body)
{
global $weburl;
//$body = strtolower($body);
$img_array = array();
preg_match_all("/(src|SRC)=[\"|'| ]{0,}((http|HTTP):\/\/(.*)\.(gif|jpg|GIF|JPG|png))/isU",$body,$img_array);
$img_array = array_unique($img_array[2]);
foreach($img_array as $key=>$value)
{
$url = $value;
$fileurl = "/pic.php?s=".base64_encode($url);
$body = str_replace($url,$fileurl,$body);
}
return $body;
}