array_rand
(PHP 4 )
array_rand -- Pick one or more random entries out of an
array
Description
mixed array_rand ( array input [, int num_req])
array_rand() is rather useful when you want to pick one
or more random entries out of an array. It takes an input
array and an optional argument num_req which specifies how
many entries you want to pick - if not specified, it defaults
to 1.
If you are picking only one entry, array_rand() returns
the key for a random entry. Otherwise, it returns an array
of keys for the random entries. This is done so that you
can pick random keys as well as values out of the array.
Note: As of PHP 4.2.0, there is no need to seed the random
number generator with srand() or mt_srand() as this is now
done automatically.
Example 1. array_rand() example
<?php
srand((float) microtime() * 10000000);
$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";
?>
See also shuffle().
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