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highly efficient Mod 10 function for credit card validation

Type:	code fragment
Added by:	jlopez123
Entered:	23/07/2003
Last modified:	07/12/2002
Rating:	- (fewer than 3 votes)
Views:	6184

this is a very simple function that performs a mod 10 on a credit card number. this function is not meant to be a complete solution, I only wanted to show how the mod 10 portion of a credit card validation function could be done quickly and efficiently.

<?php
function mod10cc( $ccnum ) {

                                $double = array( 0,2,4,6,8,1,3,5,7,9 );

                                $ccnum = strrev( $ccnum );

                                for( $i=0; $i<strlen( $ccnum ); $i++ )

                                    $values[] = ( $i&1 ) ? $double[$ccnum[$i]] : $ccnum[$i];

                                return ( array_sum( $values ) % 10 ) ? 0 : 1;

                            }
?>

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