Summary of Methods of Obtaining Domain Name by PHP

This paper summarizes the method of obtaining domain name by PHP. Share it for your reference. The specific implementation method is as follows:

Method 1 (using system variables)

// Disadvantages do not use passed addresses and hosts that do not support system variables 

echo $_SERVER['HTTP_HOST'];

　　　

Method 2 (with its own function)

$url = 'https://www.ofstack.com/index.php?referer=ofstack.com'; 　　　 

$arr_url = parse_url($url); 　　　 

echo $arr_url['host'];

Method 3 (write your own function)

function getdomain($url)   　  　   　   

{   　  　   　   

  　  　  $url = str_replace('http://', " ,$url); 　  // If there is http Prefix , Remove  

  　  　  $pos = strpos($url,'/');   　  　   　   

  　  　  if($pos === false)   　  　   　   

   　  　   　  {   　  　   　   

    　  　   　    　  　    return $url;   　  　   　   

   　  　   　  }else  　  　   

   　  　   　  {   　  　   　   

    　  　   　    　  　    return substr($url, 0, $pos);   　  　   　   

   　  　   　  }   　  　   　   

}   　  　   　   

echo getdomain($url);

Method 4 (using regularity)

preg_match("/^(http://)?([^/]+)/i", $url, $arr_domain); 　　　 

echo $arr_domain[2];

I hope this article is helpful to everyone's PHP programming.