php does not use regular verification for real and fake ID CARDS

Look directly at the code, a very simple PHP class

<?php 

$IDCard = new IDCard(); 

var_dump($IDCard::isCard($_GET['card'])); 

  

/** 

 *  Id card Processing  

 */

class IDCard { 

  

    // Check whether the ID card is correct  

    public static function isCard($card) { 

        $card = self::to18Card($card); 

        if (strlen($card) != 18) { 

            return false; 

        } 

  

        $cardBase = substr($card, 0, 17); 

  

        return (self::getVerifyNum($cardBase) == strtoupper(substr($card, 17, 1))); 

    } 

  

  

    // formatting 15 The digit ID number is 18 position  

    public static function to18Card($card) { 

        $card = trim($card); 

  

        if (strlen($card) == 18) { 

            return $card; 

        } 

  

        if (strlen($card) != 15) { 

            return false; 

        } 

  

        //  If the ID order code is 996 997 998 999 These are special codes for people over 100 years old  

        if (array_search(substr($card, 12, 3), array('996', '997', '998', '999')) !== false) { 

            $card = substr($card, 0, 6) . '18' . substr($card, 6, 9); 

        } else { 

            $card = substr($card, 0, 6) . '19' . substr($card, 6, 9); 

        } 

        $card = $card . self::getVerifyNum($card); 

        return $card; 

    } 

  

    //  Calculate id check code according to national standard gb 11643-1999 

    private static function getVerifyNum($cardBase) { 

        if (strlen($cardBase) != 17) { 

            return false; 

        } 

        //  The weighting factor  

        $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 

  

        //  The corresponding value of the check code  

        $verify_number_list = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 

  

        $checksum = 0; 

        for ($i = 0; $i < strlen($cardBase); $i++) { 

            $checksum += substr($cardBase, $i, 1) * $factor[$i]; 

        } 

  

        $mod = $checksum % 11; 

        $verify_number = $verify_number_list[$mod]; 

  

        return $verify_number; 

    } 

} 

?>  

In addition, the website also provides the following tools for the identification number verification:

http://tools.ofstack.com/bianmin/sfz