The credit_card class provides methods for cleaning, validating and
identifying the type of credit card number.
credit_card::clean_no() method
------------------------------
Strips all non-numeric characters from the passed value and returns
an integer. This method is called by the other methods in the
credit_card class.
USAGE EXAMPLE:
$cc_no ="5454 5454 5454 5454"; // Has spaces for readability
$cleaned_cc_no = credit_card::clean_no ($cc_no);
print $cleaned_cc_no; // Displays 5454545454545454
credit_card::identify() method
------------------------------
Finds the type of credit card (Mastercard, Visa, etc...) based on
the length and format of the credit card number. The method can
identify American Express, Diners Club/Carte Blanche, Discover,
enRoute, JCB, Mastercard and Visa cards.
USAGE EXAMPLE:
$cc_no ="5454 5454 5454 5454";
print credit_card::identify ($cc_no); // Returns "Mastercard"
credit_card::validate() method
------------------------------
Validate a credit card number using the LUHN formula (mod 10).
Note that many other kinds of card and account numbers are based on
the LUHN algorith - including Canadian Social Insurance Numbers.
USAGE EXAMPLE:
$cc_no ="5454 5454 5454 5454";
print credit_card::validate ($cc_no); // Returns TRUE
credit_card::check() method
---------------------------
The check() method validates and identifies a credit card, returning
an array. Indexes 0 and 'valid' will contain TRUE if the card number
is valid (FALSE if it isn't), while indexes 1 and 'type' will
the type of card (if known). The presence of the numeric keys allows
the method to be used with the list() function.
USAGE EXAMPLE:
$cc_no ="4111 1111 1111 1111";
list ($valid, $type) = credit_card::check ($cc_no);
print $valid; // Displays 1 (TRUE)
print $type; // Displays "Visa"
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