防止随机PHP生成器包含零

Question

I have a php script that creates a random 10 digit order number:

// Assign order number length
$digits = 10;

// Create random order number to be stored with this order
$order_number = rand(pow(10, $digits-1), pow(10, $digits)-1);

How do I prevent this from ever including the digit zero 0 in the random 10 digit number? Thanks in advance!

Answer 1

You can do fancy base conversions, but in the end, the most straightforward way is to just get a string:

function random_string($count, $available) {
    $result = '';
    $max = strlen($available) - 1;

    for($i = 0; $i < $count; $i++) {
        $result .= $available[rand(0, $max)];
    }

    return $result;
}

…
$order_number = random_string($digits, '123456789');

Answer 2

You can treat it as a number of base 9

base_convert(rand(0, pow(9, $digits) - 1), 10, 9)

This will give you numbers with digits from 0 to 8.

Now just add 1 to every digit to make it 1 to 9

(pow(10, $digits) - 1) / 9

will give you a number filled with ones. Now just add it to your previous number and there you go:

$digits = 10;

$order_number = (pow(10, $digits) - 1) / 9 + base_convert(rand(0, pow(9, $digits) - 1), 10, 9);

Answer 3

Try this :D

function getRandom($from, $to){
    $num = rand($from, $to);
    $have_zero = true;
    $strNum = strval($num);
    while ($have_zero){
        $have_zero = false;
        for ($i = 0; $i < sizeof($strNum); $i++){
            if ($strNum[$i] == '0'){
                $have_zero = true;
                $num = rand($from, $to);
                $strNum = strval($num);
                break;
            }
        }
    }
    return $num;
}
getRandom(1111111111, 9999999999);

Answer 4

You could use a simple function like this:

function getRandom($length) {
    $numbers = '';
    for($i = 0; $i < $length; $i++) {
        $numbers .= rand(1, 9);
    }
    return $numbers;
}

echo getRandom(10);

Answer 5

I would make a function.

<?php

function myRandomNumberWithoutZeros($digits)
{
    $result = str_replace("0", "",rand(pow(10,$digits-1), pow(10, $digits)-1)."");
    $resultLength = strlen($result);
    if($resultLength < $digits)
    {
        return intval($result.myRandomNumberWithoutZeros($digits-$resultLength));
    }
    return intval($result); 
}
echo myRandomNumberWithoutZeros(10);

?>