name : DiscountsUtil.php <?php /** * DiscountsUtil class file. */ namespace Automattic\WooCommerce\Utilities; /** * The DiscountsUtil class provides utilities to assist discounts calculation and validation. */ class DiscountsUtil { /** * Checks if the given email address(es) matches the ones specified on the coupon. * * @param array $check_emails Array of customer email addresses. * @param array $restrictions Array of allowed email addresses. * * @return bool */ public static function is_coupon_emails_allowed( $check_emails, $restrictions ) { foreach ( $check_emails as $check_email ) { // With a direct match we return true. if ( in_array( $check_email, $restrictions, true ) ) { return true; } // Go through the allowed emails and return true if the email matches a wildcard. foreach ( $restrictions as $restriction ) { // Convert to PHP-regex syntax. $regex = '/^' . str_replace( '*', '(.+)?', $restriction ) . '$/'; preg_match( $regex, $check_email, $match ); if ( ! empty( $match ) ) { return true; } } } // No matches, this one isn't allowed. return false; } }