PHP | Form Validation Function

PHP Form Validation Function for your site.

function validate_email($input_email)
   {  
   $input_email = preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $input_email);
   $input_email = trim($input_email);  
            $input_email = htmlspecialchars($input_email);  
            $input_email = stripcslashes($input_email);
   return $input_email;
   }