Get the Domain Name from the HTTP Host

• 1). Create an empty variable called "$current_domain," or whatever you wish to call it. For example, you may use "$current_domain = '';" in your code.
  
  
• 2). Set $current_domain to the text of the HTTP host. The HTTP host is the part of the URL that comes after "http://" and it contains the domain name. It may also contain a "www," which you don't want. You may get the HTTP host from the $_SERVER global array. Try "$current_domain = $_SERVER['HTTP_HOST'];" as your code.
  
  
• 3). Make sure you have a domain name. If $current_domain is still empty, then the user's browser didn't request a URL with a domain name. This could mean that your script is being run on a command-line or other context besides in a web page.
  
  
• 4). Remove the "www." if it's there. Use preg_replace() to do this. Try "preg_replace('/^www\./i', '', 1);" as your code. The last parameter, with the value "1," doubly-ensures that you strip out only the first "www." from the text.
  
  In a web context, "$current_domain" will now contain the domain name of the URL where your script is running. That is, it will contain the domain name of the current web page.