生成从10000000到99999999的唯一随机数

Question

I need to create unique random pins using numbers only. I need to produce between 10,000,000 and 99,999,999. I need to create 100,000 pins

Here's the code I am currently using:

function UniqueRandomNumbersWithinRange($min, $max, $quantity) {
    $numbers = range($min, $max);
    shuffle($numbers);
    return array_slice($numbers, 0, $quantity);
}
print_r( UniqueRandomNumbersWithinRange(10000000,99999999,100000));

This code still runs okay with my server using 50000 but not with 100000 items. Can you help me, is there code that can produce this many unique numbers without using too much memory in the server?

Answer 1

I believe this should do the trick for you:

<?php
    function UniqueRandomNumbersWithinRange($min, $max, $quantity) {
        $i = 0;
        $numbers = array();
        while( $i <= $quantity ){
            $numbers[$i] = mt_rand($min, $max);
            $i++;
        }
        print_r( $numbers );
    }
    UniqueRandomNumbersWithinRange(10000000,99999999,100000);   
?>  

As of the comment to my answer, there is a posibility of multiple keys containing the same pin. This code will eliminate duplicates, but takes a lot more computing time:

<?php
    function UniqueRandomNumbersWithinRange($min, $max, $quantity) {
        $i = 0;
        $numbers = array();
        while( $i <= $quantity ){
            $number = mt_rand( $min, $max );
            if( !in_array( $number, $numbers ) ){
                $numbers[$i] = $number;
                $i++;
            }           
        }
        print_r( $numbers );
    }
    UniqueRandomNumbersWithinRange(10000000,99999999,100000);   
?>