$array = array(‘rajan’, ‘kumar’, ‘maharjan’);function permutation($arr, $temp_string, &$collect) { if ($temp_string != “”) $collect []= $temp_string; for ($i=0; $i<sizeof($arr);$i++) { $arrcopy = $arr; $elem = array_splice($arrcopy, $i, 1); if (sizeof($arrcopy) > 0) { permutation($arrcopy, $temp_string .” ” . $elem[0], $collect); } else { $collect []= $temp_string. ” ” . $elem[0]; } } } $collect = array();permutation($array, “”, $collect);for($i=0;$i<count($collect);$i++){ for($j=0;$j<=$i;$j++){ $spaceCountI = explode(” “,$collect[$i]); $spaceCountJ = explode(” “,$collect[$j]); if($spaceCountJ>=$spaceCountI){ $temp = $collect[$j]; $collect[$j] = $collect[$i]; $collect[$i] = $temp; } } }echo “<pre>”;print_r(array_reverse($collect));echo “</pre>”;