'/^4\d{12}(\d{3})?$/', 'mastercard' => '/^(5[1-5]\d{4}|677189)\d{10}$/', 'diners' => '/^3(0[0-5]|[68]\d)\d{11}$/', 'discover' => '/^6(?:011|5[0-9]{2})[0-9]{12}$/', 'elo' => '/^((((636368)|(438935)|(504175)|(451416)|(636297))\d{0,10})|((5067)|(4576)|(4011))\d{0,12})$/', 'amex' => '/^3[47]\d{13}$/', 'jcb' => '/^(?:2131|1800|35\d{3})\d{11}$/', 'aura' => '/^(5078\d{2})(\d{2})(\d{11})$/', 'hipercard' => '/^(606282\d{10}(\d{3})?)|(3841\d{15})$/', 'maestro' => '/^(?:5[0678]\d\d|6304|6390|67\d\d)\d{8,15}$/', ); // Run test foreach ( $cards as $number ) { $brand = 'undefined'; foreach ( $brands as $_brand => $regex ) { if ( preg_match( $regex, $number ) ) { $brand = $_brand; break; } } echo '

' . print_r( array( $number, $brand ), true ) . '

'; }