shuffle
    (PHP 3>= 3.0.8, PHP 4 , PHP 5)
shuffle -- Shuffle an array
Description
bool 
shuffle ( array &array)
     This function shuffles (randomizes the order of the elements in)
     an array. 
     
Example 1. shuffle() example 
<?php $numbers = range(1, 20); srand((float)microtime() * 1000000); shuffle($numbers); while (list(, $number) = each($numbers)) {     echo "$number "; } ?>
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    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.
     See also arsort(), asort(),
     ksort(), rsort(),
     sort(), and usort().