<?php
$array = array(2, 2, 1, 3, 3, 3, 4, 4, 5, 5, 6);

for ($j = 0; $j < 5; $j++){
	$nuevo = array();
	$nuevo[] = $array[array_rand($array)];
	$i = 1;
	while ($i < 3)
	    if (!in_array($aux = $array[array_rand($array)], $nuevo)){
	        $nuevo[] = $aux;
	        $i++;
	    }
	echo implode(', ', $nuevo) . "\n";
}