Email Validator

A simple email validator

1. Copy this into your PHP Script

//-----------------------
// Email Checker
//-----------------------
function check_email_address($email) {

  if (!ereg("[^@]{1,64}@[^@]{1,255}", $email)) {

    return false;
  }

  $email_array = explode("@", $email);
  $local_array = explode(".", $email_array[0]);
  for ($i = 0; $i < sizeof($local_array); $i++) {
     if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~.-]{0,63})|("[^(|")]{0,62}"))$", $local_array[$i])) {
      return false;
    }
  }
  if (!ereg("^[?[0-9.]+]?$", $email_array[1])) {
    $domain_array = explode(".", $email_array[1]);
    if (sizeof($domain_array) < 2) {
        return false;
    }
    for ($i = 0; $i < sizeof($domain_array); $i++) {
      if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
        return false;
      }
    }
  }
  return true;
}

2. This is an example of it in use

<?php
$email = $_POST['email'];

if (check_email_address($email)) {

if (empty($email))
{
echo "Error: Please Enter the Authors Email Address";
exit;

}
else
{
echo "Error: '$email' is Not a Valid Email Address";
exit;
}

}
//rest of the code here
?>

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