How do I generate 4 different random numbers?

[eugeniu]

Let's say I want to generate 4 different random numbers from 1 to 100. How do I do that? I only know how to generate one random number...

[papaface]

I'd do:

<?php
$i = 0;
while ($i < 4)
{
echo rand(0,100) . "<br />";
$i++;
}
?>

or:

$rand = array(rand(0,100),rand(0,100),rand(0,100),rand(0,100));
foreach ($rand as $val)
{
echo $val . "<br />";
}

or:

$rand1 = rand(0,100);
$rand2 = rand(0,100);
$rand3 = rand(0,100);
$rand4 = rand(0,100);
echo $rand1 ." ". $rand2 ." ". $rand3 ." ". $rand4;

 

[kenrbnsn]

Here's one way:

<?php
$ary = range(1,100);
shuffle($ary);
$nums = array_slice($ary,0,4);
echo '<pre>' . print_r($nums,true) . '</pre>';
?>

 

papaface: There's no guarantee that you will get 4 different numbers.

 

Ken

[GingerRobot]

papaface: what guarantees that those random numbers are different?

[papaface]

papaface: what guarantees that those random numbers are different?

Nothing, I suppose lol.

[eugeniu]

Here's one way:

<?php
$ary = range(1,100);
shuffle($ary);
$nums = array_slice($ary,0,4);
echo '<pre>' . print_r($nums,true) . '</pre>';
?>

 

papaface: There's no guarantee that you will get 4 different numbers.

 

Ken

 

Oo, thanks. Is there any way I can make each generated number a separate variable with that?

[kenrbnsn]

<?php
$ary = range(1,100);
shuffle($ary);
list($num1,$num2,$num3,$num4) = array_slice($ary,0,4);
?>

 

Or you could just reference each array item.

 

Ken

[eugeniu]

Oh, thanks Ken!