(PHP 4, PHP 5, PHP 7)
array_rand — Pick one or more random keys out of an array
Picks one or more random entries out of an array, and returns the key (or keys) of the random entries. It uses a pseudo random number generator that is not suitable for cryptographic purposes.
arrayThe input array.
numSpecifies how many entries should be picked.
When picking only one entry, array_rand() returns
the key for a random entry. Otherwise, an array of keys for the random
entries is returned. This is done so that random keys can be picked
from the array as well as random values. Trying to pick more elements
than there are in the array will result in an
E_WARNING level error, and NULL will be returned.
| Version | Description |
|---|---|
| 7.1.0 | The internal randomization algorithm has been changed to use the » Mersenne Twister Random Number Generator instead of the libc rand function. |
| 5.2.10 | The resulting array of keys is no longer shuffled. |
Example #1 array_rand() example
<?php
$input = array("Neo", "Morpheus", "Trinity", "Cypher", "Tank");
$rand_keys = array_rand($input, 2);
echo $input[$rand_keys[0]] . "\n";
echo $input[$rand_keys[1]] . "\n";
?>