Arrays
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<?php
//Use &$array to avoid stack explosion.
//PHP4 probably needs something slightly different
//since it has true references & counting.
function shuffle(&$array){
//Assumes array is 0-based integer keys
//Initialize the random number generator once, and only once,
//Even if we call shuffle function twice in one script.
if (!isset($randinit)){
srand((double) microtime() * 1000000);
static $randinit = 1;
}
//Start at the end and work our way forward,
//always swapping a randomly selected item
//with the current 'last' one.
$last = count($array);
while ($last > 1){
//Earlier versions of PHP had different args for rand().
$random = rand(0, $last);
//Swap the randomly selected element with the last element.
$temp = $array[$random];
$array[$random] = $array[$last];
$array[$last] = $temp;
//Move 'forward' in array
$last--;
}
return 1;
}
?>
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Usage Example
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<?php
$test = array(1, 2, 3, 4, 5);
shuffle($test);
while (list(,$item) = each($test)){
echo $test, "<BR>n";
}
?>
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