(PHP 4, PHP 5, PHP 7)
array_rand — Pick one or more random entries out of an array
Picks one or more random entries out of an array, and returns the key (or keys) of the random entries.
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 | 
|---|---|
| 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";
?>