经常需要判断文件是否可以访问,可以通过http状态码判别,200为正常访问,404为找不到该页面,代码如下:
<?php // 设置url $url = 'http://www.phprm.com'; function get_http_status_code($url) { if(emptyempty($url)) return false; $url = parse_url($url); $host = isset($url['host']) ? $url['host'] : ''; $port = isset($url['port']) ? $url['port'] : '80'; $path = isset($url['path']) ? $url['path'] : ''; $query = isset($url['query']) ? $url['query'] : ''; $request = "HEAD $path?$query HTTP/1.1\r\n" ."Host: $host\r\n" ."Connection: close\r\n" ."\r\n"; $address = gethostbyname($host); $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_connect($socket, $address, $port); socket_write($socket, $request, strlen($request)); $response = split(' ', socket_read($socket, 1024)); socket_close($socket); return trim($response[1]); } echo get_http_status_code($url); ?>
另一种获取http状态码的办法
使用curl需要在php.ini中设置启用才行 >< Windows的服务器中,打开php.ini,找到:
extension=php_curl.dll
去掉前面的注释既可.
PHP实例代码如下:
<?php $curl = curl_init(); $url='http://www.phprm.com'; curl_setopt($curl, CURLOPT_URL, $url); //设置URL curl_setopt($curl, CURLOPT_HEADER, 1); //获取Header curl_setopt($curl,CURLOPT_NOBODY,true); //Body就不要了吧,我们只是需要Head curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); //数据存到成字符串吧,别给我直接输出到屏幕了 $data = curl_exec($curl); //开始执行啦~ echo curl_getinfo($curl,CURLINFO_HTTP_CODE); //我知道HTTPSTAT码哦~ curl_close($curl); //用完记得关掉他 ?>
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