php opens other websites to get status codes

php Open other websites to get status codes?

php Get http status code program code

It is often necessary to determine whether the file can be accessed. You can judge it by the http status code. 200 means normal access, 404 means the page cannot be found. The code is as follows

<?php
// 设置url
$url = &#39;http://www.111cn.net&#39;;
function get_http_status_code($url) {
 if(empty($url)) return false;
 $url = parse_url($url);
 $host = isset($url[&#39;host&#39;]) ? $url[&#39;host&#39;] : &#39;&#39;;
 $port = isset($url[&#39;port&#39;]) ? $url[&#39;port&#39;] : &#39;80&#39;;
 $path = isset($url[&#39;path&#39;]) ? $url[&#39;path&#39;] : &#39;&#39;;
 $query = isset($url[&#39;query&#39;]) ? $url[&#39;query&#39;] : &#39;&#39;;
 $request = "HEAD $path?$query HTTP/1.1rn"
           ."Host: $hostrn"
           ."Connection: closern"
           ."rn";
 $address = gethostbyname($host);
 $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
 socket_connect($socket, $address, $port);
 socket_write($socket, $request, strlen($request));
 $response = split(&#39; &#39;, socket_read($socket, 1024));
 socket_close($socket);
 return  trim($response[1]);
}
echo get_http_status_code($url);

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