PHP中排列组合及性能对比

function getCombinationToString($arr,$m){
$result = array();
if ($m ==1){
return $arr;
}

if ($m == count($arr)){
$result[] = implode(',' , $arr);
return $result;
}

$temp_firstelement = $arr[0];
unset($arr[0]);
$arr = array_values($arr);
$temp_list1 = getCombinationToString($arr, ($m-1));

foreach ($temp_list1 as $s){
$s = $temp_firstelement.','.$s;
$result[] = $s;
}
unset($temp_list1);

$temp_list2 = getCombinationToString($arr, $m);
foreach ($temp_list2 as $s){
$result[] = $s;
}
unset($temp_list2);

return $result;
}
$arr = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18);
$t = getCombinationToString($arr, 6);

var_dump($t);

function getCombinAryByNum( $arr, $num,$t=array()) {
if ($num == 0) {
return array($t);
}
$r = array();
for ($i=0,$l=count($arr); $i <= $l-$num; $i++) {
$tmp = getCombinAryByNum( array_slice($arr, $i+1, $l, false), $num-1,array_merge($t, array($arr[$i])));
$r = array_merge($r, $tmp);
}
return $r;
}

$arr = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18);
$numum = 6;
$ss = getCombinAryByNum($arr,$numum);

var_dump($ss);