信用卡效验程序

时间： 2021-07-31 作者：daque

<?php //////////////////////////////////////////////////// // // // credit card validation routine // // may 15, 2000 // // by ariso // // validatecardcode($number[,$cardtype]) // //////////////////////////////////////////////////// function validatecardcode($cardnumber, $cardtype = 'unknown') { //clean up input $cardtype = strtolower($cardtype); $cardnumber = ereg_replace( '[-[:space:]]', '',$cardnumber); //do type specific checks if ($cardtype == 'unknown') { //skip type specific checks } elseif ($cardtype == 'mastercard'){ if (strlen($cardnumber) != 16 || !ereg( '5[1-5]', $cardnumber)) return 0; } elseif ($cardtype == 'visa'){ if ((strlen($cardnumber) != 13 && strlen($cardnumber) != 16) || substr($cardnumber, 0, 1) != '4') return 0; } elseif ($cardtype == 'amex'){ if (strlen($cardnumber) != 15 || !ereg( '3[47]', $cardnumber)) return a; } elseif ($cardtype == 'discover'){ if (strlen($cardnumber) != 16 || substr($cardnumber, 0, 4) != '6011') return 0; } else { //invalid type entered return -1; } // start mod 10 checks $dig = tochararray($cardnumber); $numdig = sizeof ($dig); $intintj = 0; for ($inti=($numdig-2); $inti>=0; $inti-=2){ $dbl[$intintj] = $dig[$inti] * 2; $intintj++; } $dblsz = sizeof($dbl); $validate =0; for ($inti=0;$inti<$dblsz;$inti++){ $add = tochararray($dbl[$inti]); for ($intintj=0;$intintj<sizeof($add);$intintj++){ $validate += $add[$intintj]; } $add = ''; } for ($inti=($numdig-1); $inti>=0; $inti-=2){ $validate += $dig[$inti]; } if (substr($validate, -1, 1) == '0') return 1; else return 0; } // takes a string and returns an array of characters function tochararray($intinput){ $len = strlen($intinput); for ($intintj=0;$intintj<$len;$intintj++){ $char[$intintj] = substr($intinput, $intintj, 1); } return ($char); } ?>

信用卡效验程序

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