信用卡效验程序

2024-05-04 22:15:03

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<?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 {

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