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Task/Knuth-shuffle/PHP/knuth-shuffle.php

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+//The Fisher-Yates original Method
+function yates_shuffle($arr){
+	$shuffled = Array();
+	while($arr){
+		$rnd = array_rand($arr);
+		$shuffled[] = $arr[$rnd];
+		array_splice($arr, $rnd, 1);
+	}
+	return $shuffled;
+}
+
+//The modern Durstenfeld-Knuth algorithm
+function knuth_shuffle(&$arr){
+	for($i=count($arr)-1;$i>0;$i--){
+		$rnd = mt_rand(0,$i);
+		list($arr[$i], $arr[$rnd]) = array($arr[$rnd], $arr[$i]);
+	}
+}