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A set of functions to check the validity of a credit card number. ccValidate ($number, $type) returns 1 if the account number is valid, zero if not. The $type argument is optional. If included, it will perform additional checking to ensure the card is of the type specified. Valid types include: visa, mastercard, discover, and amex. <?php //////////////////////////////////////////////////// // // // Credit card validation routine // // May 15, 1998 // // By Brett Error // // brett@interwebdesign.com // // // // validateCC($number[,$type]) // // Uses the MOD 10 algorythm to determine if a // // credit card number is valid. // // // // $number = credit card account number // // $type is optional. Setting type to // // visa, mastercard, discover, or amex will // // perform additional checking on the account // // number. // // // // The function returns 1 (true) if the CC is // // valid, 0 (false) if it is invalid, and -1 if // // the type entered does not match the supported // // types listed above. // // // //////////////////////////////////////////////////// function validateCC($ccnum, $type = 'unknown'){ //Clean up input $type = strtolower($type); $ccnum = ereg_replace( '[-[:space:]]', '',$ccnum); //Do type specific checks if ($type == 'unknown') { //Skip type specific checks } elseif ($type == 'mastercard'){ if (strlen($ccnum) != 16 || !ereg( '^5[1-5]', $ccnum)) return 0; } elseif ($type == 'visa'){ if ((strlen($ccnum) != 13 && strlen($ccnum) != 16) || substr($ccnum, 0, 1) != '4') return 0; } elseif ($type == 'amex'){ if (strlen($ccnum) != 15 || !ereg( '^3[47]', $ccnum)) return a; } elseif ($type == 'discover'){ if (strlen($ccnum) != 16 || substr($ccnum, 0, 4) != '6011') return 0; } else { //invalid type entered return -1; } // Start MOD 10 checks $dig = toCharArray($ccnum); $numdig = sizeof ($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;$j<sizeof($add);$j++){ $validate += $add[$j]; } $add = ''; } for ($i=($numdig-1); $i>=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); } ?> | ||||||||||
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