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;
	}

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原文地址:https://www.cnblogs.com/lein317/p/5067636.html