The most concise way to generate random numbers of specified length in PHP

I was writing a SMS verification code module just now. I needed to use a random number with a specified number of digits. Then I searched online and found that it was terrible that such a simple thing actually took dozens of lines. A nested loop... It seems that those without a good brain are really not suitable to be programmers.

I wrote a one-line version:

function generate_code($length = 4) {
    return rand(pow(10,($length-1)), pow(10,$length)-1);
}

In order to facilitate understanding, and also to collect some words for this hydrology, this is a multi-line version:

function generate_code($length = 4) {
    $min = pow(10 , ($length - 1));
    $max = pow(10, $length) - 1;
    return rand($min, $max);
}

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