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preg_match in function adds 0 or 1. Why?

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I have a thing I dont get.


I found this regex part to check for correct subdomains.

       function check_subdomain($data){
		 if (!empty($data)){
	         $data = preg_match("/^(?:[A-Za-z0-9][A-Za-z0-9\-]{0,61}[A-Za-z0-9]|[A-Za-z0-9])$/", $data);
		else { }

      echo check_subdomain($data);

but the strange thing is that echo check_subdomain($data) outputs the input and adds a 0 when wrong and a 1 when correct.


why is this done and how to avoid it?



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That's not all of your code. I suspect you're printing out $data somewhere else.


You have an unnecessary else statement, just remove that from your code.


You can simplify your function to just this:

function check_subdomain($data){
  return preg_match("/^(?:[A-Za-z0-9][A-Za-z0-9\-]{0,61}[A-Za-z0-9]|[A-Za-z0-9])$/", $data);
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