random numbers not repeat

[aj123cd]

Is there a simple way to do this?

I want to pick 3 numbers between 1 and 10 randomly. But I want to make sure there is no chance for the same number showing up.

Correct 4,10,7

Incorrect 4,4,10
can any one tell me how can i do it?
thanks

[Xardas der Dunkle]

Code: Select all

<?php
function getRandomNumber($min, $max) {
    static $alreadyExists = array();

    // Avoid endles-loop
    if(count($alreadyExists) < ($max+$min)) {
        do {
            $i = rand($min, $max);
        } while(isset($alreadyExists[ $i ]));

        $alreadyExists[ $i ] = true;

        return $i;
    } else {
        return null;
    }
}

for($i=0; $i<20; $i++) {
    var_dump(getRandomNumber(0, 10));
}
 

[Wiedmann]

for example:

Code: Select all

<?php
$randNums = array();
while (3 != count($randNums)) {
    $randNums[mt_rand(1, 10)] = null;
}
$randNums = array_keys($randNums);

var_dump($randNums);
?>

A function might also be a good idea (@Xardas der Dunkle) :

Code: Select all

<?php
function get_unique_range($count, $min, $max)
{
    if (($max - $min + 1) < $count) {
        return false;
    }

    $randNums = array();
    while ($count != count($randNums)) {
        $randNums[mt_rand($min, $max)] = null;
    }
    $randNums = array_keys($randNums);    

    return $randNums;
}

var_dump(get_unique_range(3, 1, 10));
?>

[aj123cd]

Xardas der Dunkle , Wiedmann
Thank you 4u help.