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<?php
/*
$Id$
osCommerce, Open Source E-Commerce Solutions
http://www.oscommerce.com
Copyright (c) 2010 osCommerce
Released under the GNU General Public License
*/
////////////////////////////////////////////////////////////////////////////////////////////////
//
// Function : tep_validate_email
//
// Arguments : email email address to be checked
//
// Return : true - valid email address
// false - invalid email address
//
// Description : function for validating email address that conforms to RFC 822 specs
//
// This function will first attempt to validate the Email address using the filter
// extension for performance. If this extension is not available it will
// fall back to a regex based validator which doesn't validate all RFC822
// addresses but catches 99.9% of them. The regex is based on the code found at
// http://www.regular-expressions.info/email.html
//
// Optional validation for validating the domain name is also valid is supplied
// and can be enabled using the administration tool.
//
// Sample Valid Addresses:
//
// first.last@host.com
// firstlast@host.to
// first-last@host.com
// first_last@host.com
//
// Invalid Addresses:
//
// first last@host.com
// first@last@host.com
//
////////////////////////////////////////////////////////////////////////////////////////////////
function tep_validate_email($email) {
$email = trim($email);
if ( strlen($email) > 255 ) {
$valid_address = false;
} elseif ( function_exists('filter_var') && defined('FILTER_VALIDATE_EMAIL') ) {
$valid_address = (bool)filter_var($email, FILTER_VALIDATE_EMAIL);
} else {
if ( substr_count( $email, '@' ) > 1 ) {
$valid_address = false;
}
if ( preg_match("/[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/i", $email) ) {
$valid_address = true;
} else {
$valid_address = false;
}
}
if ($valid_address && ENTRY_EMAIL_ADDRESS_CHECK == 'true') {
$domain = explode('@', $email);
if ( !checkdnsrr($domain[1], "MX") && !checkdnsrr($domain[1], "A") ) {
$valid_address = false;
}
}
return $valid_address;
}
?>