php检查域名是否可以正常访问的方法

检查的方法如下：

function httpcode($url){

    $ch = curl_init();
  
    $timeout = 3;
  
    curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
  
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  
    curl_setopt($ch, CURLOPT_HEADER, 1);
  
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
  
    curl_setopt($ch,CURLOPT_URL,$url);
  
    curl_exec($ch);
  
    return $httpcode = curl_getinfo($ch,CURLINFO_HTTP_CODE);
  
    curl_close($ch);
  
  }

如果返回200那么正常可以访问