Randomly select x elements from an array

Posted on 2010-11-22
Medium Priority
Last Modified: 2012-05-10
I have an array, like:
$array = array('dog','cat','sam','puppy','mouse','coke');

How can I create a new array, that has only x number of elements, randomly chosen from $array?
Question by:interclubs
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LVL 20

Expert Comment

ID: 34190086

$x = 3;
$array = array('dog','cat','sam','puppy','mouse','coke');
$rand_keys = array_rand($array , $x);
echo $input[$rand_keys[0]] . "\n";
echo $input[$rand_keys[1]] . "\n";
echo $input[$rand_keys[3]] . "\n";
LVL 13

Accepted Solution

dsmile earned 2000 total points
ID: 34190281
Use shuffle() to make array randomly ordered, and then pick up x element(s) to create new array by using array_splice()
$array = array('dog','cat','sam','puppy','mouse','coke');

//reorder the array randomly

//create new array
$n = 3; // change this to x number you want
$newarray = array_splice($array, $n);


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Author Closing Comment

ID: 34190497
LVL 20

Expert Comment

ID: 34190561
Just curious for my own future reference...what was wrong with my solution?

Author Comment

ID: 34190606
It didn't work. I think you meant:

$x = 3;
$array = array('dog','cat','sam','puppy','mouse','coke');
$rand_keys = array_rand($array , $x);
echo $array[$rand_keys[0]] . "\n";
echo $array[$rand_keys[1]] . "\n";
echo $array[$rand_keys[2]] . "\n";

(Changed parts in bold). That made it work, but it still wasn't giving me a new array, it was just randomly picking elements from an array.

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