php保存远程文件及抓URL数据

//保存远程文件
function saveRemoteImg($sUrl){
	global $upExt,$maxAttachSize;
	$reExt='('.str_replace(',','|',$upExt).')';
	if(substr($sUrl,0,10)=='data:image'){//base64编码的图片，可能出现在firefox粘贴，或者某些网站上，例如google图片
		if(!preg_match('/^data:image\/'.$reExt.'/i',$sUrl,$sExt))return false;
		$sExt=$sExt[1];
		$imgContent=base64_decode(substr($sUrl,strpos($sUrl,'base64,')+7));
	}
	else{//url图片
		if(!preg_match('/\.'.$reExt.'$/i',$sUrl,$sExt))return false;
		$sExt=$sExt[1];
		$imgContent=getUrl($sUrl);
	}
	if(strlen($imgContent)>$maxAttachSize)return false;//文件体积超过最大限制
	$sLocalFile=getLocalPath($sExt);
	file_put_contents($sLocalFile,$imgContent);
	//检查mime是否为图片，需要php.ini中开启gd2扩展
	$fileinfo= @getimagesize($sLocalFile);
	if(!$fileinfo||!preg_match("/image\/".$reExt."/i",$fileinfo['mime'])){
		@unlink($sLocalFile);
		return false;
	}
	return str_replace('../','/',$sLocalFile);
}
//抓URL数据
function getUrl($sUrl,$jumpNums=0){
	$arrUrl = parse_url(trim($sUrl));
	if(!$arrUrl)return false;
	$host=$arrUrl['host'];
	$port=isset($arrUrl['port'])?$arrUrl['port']:80;
	$path=$arrUrl['path'].(isset($arrUrl['query'])?"?".$arrUrl['query']:"");
	$fp = @fsockopen($host,$port,$errno, $errstr, 30);
	if(!$fp)return false;
	$output="GET $path HTTP/1.0\r\nHost: $host\r\nReferer: $sUrl\r\nConnection: close\r\n\r\n";
	stream_set_timeout($fp, 60);
	@fputs($fp,$output);
	$Content='';
	while(!feof($fp))
	{
		$buffer = fgets($fp, 4096);
		$info = stream_get_meta_data($fp);
		if($info['timed_out'])return false;
		$Content.=$buffer;
	}
	@fclose($fp);
	global $jumpCount;//重定向
	if(preg_match("/^HTTP\/\d.\d (301|302)/is",$Content)&&$jumpNums<5)
	{
		if(preg_match("/Location:(.*?)\r\n/is",$Content,$murl))return getUrl($murl[1],$jumpNums+1);
	}
	if(!preg_match("/^HTTP\/\d.\d 200/is", $Content))return false;
	$Content=explode("\r\n\r\n",$Content,2);
	$Content=$Content[1];
	if($Content)return $Content;
	else return false;
}