PHP randomly generates unique 8-digit card number (number) and card secret (string)

1. Generate non-repeating random numbers with customizable length

/**
 * 生成不重复的随机数字
 * @param  int $start  需要生成的数字开始范围
 * @param  int $end    结束范围
 * @param  int $length 需要生成的随机数个数
 * @return number      生成的随机数
 */
function getRandNumber($start=0,$end=9,$length=8){
//初始化变量为0
$connt = 0;
//建一个新数组
$temp = array();
while($connt < $length){
//在一定范围内随机生成一个数放入数组中
$temp[] = mt_rand($start, $end);
//$data = array_unique($temp);
//去除数组中的重复值用了“翻翻法”，就是用array_flip()把数组的key和value交换两次。这种做法比用 array_unique() 快得多。
$data = array_flip(array_flip($temp));
//将数组的数量存入变量count中
$connt = count($data);
}
//为数组赋予新的键名
shuffle($data);
//数组转字符串
$str=implode(",", $data);
//替换掉逗号
$number=str_replace(&#39;,&#39;, &#39;&#39;, $str);
return $number;
}

2. Randomly generate non-repeating 8-digit card password

function makeCardPassword() {
        $code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $rand = $code[rand(0,25)]
            .strtoupper(dechex(date('m')))
            .date('d').substr(time(),-5)
            .substr(microtime(),2,5)
            .sprintf('%02d',rand(0,99));
        for(
            $a = md5( $rand, true ),
            $s = '0123456789ABCDEFGHIJKLMNOPQRSTUV',
            $d = '',
            $f = 0;
            $f < 8;
            $g = ord( $a[ $f ] ),
            $d .= $s[ ( $g ^ ord( $a[ $f + 8 ] ) ) - $g & 0x1F ],
            $f++
        );
        return  $d;
}

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