在nginx环境中无法使用get_headers函数方法，所以我的站长站这次分享的是用php的file_get_contents函数来判断链接是否失效。
原理就是通过file_get_contents函数远程访问链接，判断返回的$http_response_header的HTTP 标头。
file_get_contents代码如下：
function getUrl($url) {
$content = file_get_contents($url);
return array(
'headers' => $http_response_header,
'content' => $content
);
}
$response = getUrl('https://www.51yma.cn/');
if ($response['content'] === false)
echo $response['headers'][0]; // HTTP/1.1 401 Unauthorized
else
echo $response['content'];不加判断，以数组的形式返回数据就是这样的。
<?php
function get_contents() {
file_get_contents("https://www.51yma.cn/");
return $http_response_header;
}
var_dump(get_contents());
?>响应如下：
array(12) {
[0] => string(15) "HTTP/1.1 200 OK"
[1] => string(35) "Date: Tue, 13 Aug 2019 05:39:50 GMT"
[2] => string(38) "Content-Type: text/html; charset=UTF-8"
[3] => string(17) "Connection: close"
[4] => string(21) "Vary: Accept-Encoding"
[5] => string(46) "X-Pingback: https://vircloud.net/action/xmlrpc"
[6] => string(70) "Set-Cookie: 1ace4129ed475fea40c32ab2c48ab0c2_armxmod_online=U1; path=/"
[7] => string(14) "Server: vcloud"
[8] => string(71) "Strict-Transport-Security: max-age=15552000; includeSubdomains; preload"
[9] => string(31) "X-Xss-Protection: 1; mode=block"
[10] => string(31) "X-Content-Type-Options: nosniff"
[11] => string(27) "X-Frame-Options: SAMEORIGIN"