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Email Validation Function

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I used to have the strlen block and the 2 preg if blocks each separately return false throughout, but lately I'm in a single point of exit mindset.

I cannot take credit for the regexps - I borrowed them from someone who borrowed them. If the real author is known, please comment and attribute.

I _did_ however make one edit, which was to increase the TLD portion from 3 chars max to 4 - to account for .info email addresses. One character - my big contribution!

Enjoy

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  1. /**
  2.  * emailValid
  3.  * Email Validation Function
  4.  * I take an email as a string and test it against 2 regular expressions.
  5.  *
  6.  * @author Regexp Author unknown
  7.  * @author Phillip Harrington <[email protected]>
  8.  * @param string $email
  9.  * @return bool $valid
  10.  */
  11. function emailValid ($email)
  12. {
  13.   $valid = false;
  14.   $email = trim($email);
  15.  
  16.   if(0 < strlen($email))
  17.   {
  18.     if(!preg_match('/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/i', $email))
  19.     {
  20.       if(preg_match('/^.+\@(\[?)[-a-zA-Z0-9\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/i', $email))
  21.       {
  22.         $valid = true;
  23.       }
  24.     }
  25.   }
  26.  
  27.   return $valid;
  28. }

URL: http://www.phillipharrington.com/

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