Syntax of array_rand
mixed array_rand(array array[, int count])
Picks a random element from the given array. The second (optional) parameter can be given to specify a number of elements to pick and return. If more than one element is returned, an array of keys is returned, rather than the element’s value.
Example of array_rand
<?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";
?>