echo $items[array_rand($items)];
use array_rand()
see php manual -> http://php.net/manual/en/function.array-rand.php
<?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";
?>
If you don't mind picking the same item again at some other time:
$items[rand(0, count($items) - 1)];
Source: Stackoverflow.com