You want to scramble the elements of an array in a random order.
Use shuffle( ):
It's suprisingly tricky to properly shuffle an array. In fact, up until PHP 4.3, PHP's shuffle( ) routine wasn't a truly random shuffle. It would mix elements around, but certain combinations were more likely than others.
Therefore, you should use PHP's shuffle( ) function whenever possible.
4.20.4. See Also
Documentation on shuffle( ) at http://www.php.net/shuffle.