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PHP function which validate email address

The following PHP function gets an email address and validate it in according to the requirment and send a String message to the calling program.

function validateEmailAddress($email)
// This php function validate an E-mail address for
// 1. E-mail address is not empty
// 2. An at symbol @,
// 3. One or more characters before the @,
// 4. and a dot somewhere after @.
// This function returns a string message to the calling program
{
  $email = trim($email); // clear any extra spaces in front and end of email address
  $past = 0;
  $valid = false;
  $dot = false;
  $message = NULL;
  if(strlen($email) > 0) // email is not empty
  {
    if(strstr($email, "@")) // find @ symbol in email
    {
      for($counter=0; $counter < strlen($email); $counter++)
      {
        if($email[$counter] == "@")
        {
          $prior= $counter +1;
          $past = 0;
          $dot = false;
          continue;
        }
        if($email[$counter] == "." && $past > 0)
          $dot = true;
        $past++;
      } // end for
      if($prior > 0 && $past > 0 && $dot == true)
        $valid = true;
    } // end if
    if ($valid == false)
    {
      $message = 'Your Email address does not seem right.';
    }
  }
  else
  {
    $message = 'You forgot to enter your Email address.';
  }
  return $message;
}// end function

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