信用卡效验程序-php教程
转载自：互联网 作者：cd3c.com
您正在看的php教程是:信用卡效验程序。
////////////////////////////////////////////////////
// //
// 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;
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