Return an array of random string keys in PHP

Description

The following code shows how to return an array of random string keys.

Example

//  w w  w.j  a va  2s .co  m
<?php
    $a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
    print_r(array_rand($a,2));
?>

The code above generates the following result.