Question

我正在尝试创建任意长度的随机数，我想制作产品ID和订单ID。但是这里的问题是当我创建新项目给出id 11的长度时，它将在不改变数字之前使用相同的id。

这是我的PHP代码

<?php
function EventRang($length = 10, $type){
    switch($type){
        case 'int':
        //$keyspace = mt_rand(10000000000, 99999999999).date("Ymd").rand();
        $keyspace = str_pad(rand(0, pow(10, $length)-1), $length, '0', STR_PAD_LEFT);
        break;
        case 'char':
        $keyspace = date('Fl').'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        break;
        case 'str':
        $keyspace = time().'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        break;
        case 'oid':
        //$keyspace = date("Ymd").time().rand().mt_rand(10000000000, 99999999999);
        $keyspace = date("Ymd").time().str_pad(rand(0, pow(10, $length)-1), $length, '0', STR_PAD_LEFT);
        break;
        default:
        $keyspace = time().'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        break;
    }
    $charactersLength = strlen($keyspace);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $keyspace[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}
?>

这始终是输出2147483647

Answer 1

因为有时答案需要明确

function EventRang($length = 10, $type = 'int') {
    // Define the set of characters permitted for the random element for each type
    switch($type) {
        case 'int':
        case 'oid':
            $keyspace = '0123456789';
            break;
        case 'char':
            $keyspace = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            break;
        case 'str':
        default:
            $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    }

    // Generate the random characters/digits
    $charactersLength = strlen($keyspace);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $keyspace[rand(0, $charactersLength - 1)];
    }

    // apply the masking
    switch($type) {
        case 'int':
            return $randomString;
        case 'char':
            return date('Fl').$randomString;
            break;
        case 'str':
            return time().$randomString;
            break;
        case 'oid':
            return date("Ymd").time().$randomString;
            break;
        default:
            return time().$randomString;
    }
}

您需要将屏蔽与键空间分开; keyspace只是用于输出的随机元素的字符集;如果你试图将掩码应用为键空间的一部分，那么你只是倾斜随机性，而不是应用掩码。

另请注意，函数定义也需要类型的默认值，因为它在参数列表中的长度后面，并且length具有默认值

php随机数函数每次调用返回相同的值

1 个答案: