$ccnumber ... Type: $type ... Valid: $valid
";
}
else {
// Return some sort of error
}
________________________________________________________________________________
*/
function validateCC($ccnum){
// Clean up input
$ccnum = ereg_replace('[-[:space:]]', '',$ccnum);
// What kind of card do we have
$type = check_type($ccnum);
// Does the number matchup ?
$valid = check_number($ccnum);
return array($type, $valid);
}
// Prefix and Length checks
function check_type( $cardnumber ) {
$cardtype = "UNKNOWN";
$len = strlen($cardnumber);
if ( $len == 15 && substr($cardnumber, 0, 1) == '3' ) { $cardtype = "amex"; }
elseif ( $len == 16 && substr($cardnumber, 0, 4) == '6011' ) { $cardtype = "discover"; }
elseif ( $len == 16 && substr($cardnumber, 0, 1) == '5' ) { $cardtype = "mc"; }
elseif ( ($len == 16 || $len == 13) && substr($cardnumber, 0, 1) == '4' ) { $cardtype = "visa"; }
return ( $cardtype );
}
// MOD 10 checks
function check_number( $cardnumber ) {
$dig = toCharArray($cardnumber);
$numdig = sizeof ($dig);
$j = 0;
for ($i=($numdig-2); $i>=0; $i-=2){
$dbl[$j] = $dig[$i] * 2;
$j++;
}
$dblsz = sizeof($dbl);
$validate =0;
for ($i=0;$i<$dblsz;$i++){
$add = toCharArray($dbl[$i]);
for ($j=0;$j=0; $i-=2){
$validate += $dig[$i];
}
if (substr($validate, -1, 1) == '0') { return 1; }
else { return 0; }
}
// takes a string and returns an array of characters
function toCharArray($input){
$len = strlen($input);
for ($j=0;$j<$len;$j++){
$char[$j] = substr($input, $j, 1);
}
return ($char);
}
?>