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PHP判断远程文件是否存在
软件应用 发布时间:2018-11-24 23:28:40
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<?php
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function remote_file_exists($url_file){
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$url_file = trim($url_file);
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if (emptyempty($url_file)) { return false; }
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$url_arr = parse_url($url_file);
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if (!is_array($url_arr) || emptyempty($url_arr)){return false; }
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$host = $url_arr['host'];
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$path = $url_arr['path'] ."?".$url_arr['query'];
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$port = isset($url_arr['port']) ?$url_arr['port'] : "80";
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$fp = fsockopen($host, $port, $err_no, $err_str,30);
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if (!$fp){ return false; }
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$request_str = "GET ".$path."HTTP/1.1\r\n";
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$request_str .= "Host:".$host."\r\n";
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$request_str .= "Connection:Close\r\n\r\n";
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fwrite($fp,$request_str);
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$first_header = fgets($fp, 1024);
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fclose($fp);
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if (trim($first_header) == ""){ return false;}
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if (!preg_match("/200/", $first_header)){
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return false;
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}
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return true;
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}
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?>