php查找字符串中的http地址，并转换

function convertImg($str) { $str = preg_replace("/\{([^}]+)\}/",'<div style="border:1px dashed #003366; background-color:#f0f0f0; height:21px; color:#003399">回复：$1</div>',preg_replace("/\[(\d+)\]/",'<img src="/images/face/face$1.jpg"/>',$str)); $reg="/http\:\/\/(\w+\.)+(net|com|org|cn|kr|jp|tw)[A-Za-z0-9_&\/\?=]*/i"; if(preg_match_all($reg,$str,$out)) { for($i=0;$i<count($out[0]);$i++) { $link=substr(base64_encode(md5(preg_replace("/http\:\/\//","",$out[0][$i]))),0,10+strlen($str)%10); $str=str_replace($out[0][$i],'<a href="'.$out[0][$i].'">http://'.$link.'</a>',$str); } } return $str; }