判断文件格式并输出文件流
首先需要一个curl的方法 然后获取头信息 输出文件流
<?php function my_request($url, $data = null,$return_header=false) { $curl = curl_init(); curl_setopt($curl, CURLOPT_NOSIGNAL, 1); curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE); if (!empty($data)){ curl_setopt($curl, CURLOPT_POST, 1); curl_setopt($curl, CURLOPT_POSTFIELDS, $data); } curl_setopt($curl, CURLOPT_TIMEOUT,10);//设置超时时间 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); if($return_header) { curl_setopt($curl, CURLOPT_HEADER, 1);//返回header信息 } $output = curl_exec($curl); curl_close($curl); return $output; } $url="http://images2017.cnblogs.com/blog/704203/201708/704203-20170823105514714-1139981147.gif"; $stream=my_request($url,null,false); $header=my_request($url,null,true); $start=strpos($header,"Content-Type"); $to_header=substr($header,$start); $end=strpos($to_header,"\r\n"); $real=trim(substr($to_header,0,$end)); if($real) { header($real); echo($stream); }else { die("can not found file type"); } exit(); ?>