php验证网站404页面的两种方法

<?phpheader('content-type:text/html;charset=utf-8');function http_status_404($url) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_HEADER, 1);curl_setopt($ch, CURLOPT_NOBODY, 1);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_TIMEOUT, 5);curl_exec($ch);$status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);curl_close($ch);return ($status == 404) ? '404页面' : '可正常访问';}echo http_status_404('http://blog.sijiaomao.com/?p=36996');echo http_status_404('http://blog.sijiaomao.com/?p=1397');// two$headers = get_headers('http://blog.sijiaomao.com/?p=1397');if (strpos($headers[0], '404')) {echo "404";}else{ echo '正常访问';}