php 监测远道文件是否存在
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2022-06-17 09:50:47
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php 监测远程文件是否存在
function remote_file_exists($url_file){ $url_file = trim($url_file); if (empty($url_file)) return false; $url_arr = parse_url($url_file); if (!is_array($url_arr) || empty($url_arr)) return false; $host = $url_arr['host']; $path = $url_arr['path'] ."?".$url_arr['query']; $port = isset($url_arr['port']) ?$url_arr['port'] : "80"; $fp = fsockopen($host, $port, $err_no, $err_str,30); if (!$fp) return false; $request_str = "GET ".$path." HTTP/1.1\r\n"; $request_str .= "Host:".$host."\r\n"; $request_str .= "Connection:Close\r\n\r\n"; fwrite($fp,$request_str); $first_header = fread($fp, 128); fclose($fp); if (trim($first_header) == "") return false; if (!preg_match("/200/", $first_header) || preg_match("/Location:/", $first_header)) return false; return true; }
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