PHP检查网站是否宕机的方法示例

<?php
function networkcheck($url){
  $agent = "mozilla/5.0 (windows nt 6.1; wow64; rv:42.0) gecko/20100101 firefox/42.0";
  //curl_init-初始化一个curl会话
  $ch=curl_init();
  //curl_setopt — 为一个curl设置会话参数
  curl_setopt($ch, curlopt_url,$url );
  curl_setopt($ch, curlopt_useragent, $agent);
  curl_setopt($ch, curlopt_returntransfer, 1);
  curl_setopt($ch,curlopt_verbose,false);
  curl_setopt($ch, curlopt_timeout, 5);
  curl_setopt($ch,curlopt_ssl_verifypeer, false);
  curl_setopt($ch,curlopt_sslversion,3);
  curl_setopt($ch,curlopt_ssl_verifyhost, false);
  //curl_exec —执行一个curl会话
  $page=curl_exec($ch);
  //curl_getinfo — 获取一个curl连接资源句柄的信息
  $httpcode = curl_getinfo($ch, curlinfo_http_code);
  //curl_close()函数的作用是关闭一个curl会话，唯一的参数是curl_init()函数返回的句柄。
  curl_close($ch);
  if($httpcode>=200 && $httpcode<300)
    return true;
  else
    return false;
}
//函数参数为要检查的网站的网址路径
if(networkcheck("https://www.baidu.com"))
  echo "website ok";
else
  echo "website down";
?>