PHP Verify credit card number is correct function, PHP verified credit card number _php tutorial

PHP Verify credit card number is correct function, PHP verify credit card number

You can use the following PHP functions to verify whether a card number is a credit card:

function Validatecard ($cardnumber) {    $cardnumber = preg_replace ("/\d|\s/", "", $cardnumber); # Strip any non-digits    $cardlength = strlen ($cardnumber);   if ($cardlength! = 0)    {      $parity = $cardlength% 2;     $sum = 0;     for ($i = 0; $i < $cardlength; $i + +)      {        $digit = $cardnumber [$i];       if ($i% 2 = = $parity) $digit = $digit * 2;         if ($digit > 9) $digit = $digit-9;           $sum = $sum + $digit;     }      $valid = ($sum% = = 0);     return $valid;   }    return false;}

http://www.bkjia.com/PHPjc/1008016.html www.bkjia.com true http://www.bkjia.com/PHPjc/1008016.html techarticle PHP verifies that the credit card number is correct function, PHP verified credit card number can use the following PHP function to verify whether a card number is a credit card: function Validatecard ($cardnumber) {...

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