PHP output multi-element permutation combination _php Tutorial

Solve the problem: ask for an array of n elements to take out m elements into a new array, altogether can be combined into an array and output
[PHP]
$arr = Array (' A ', ' B ', ' C ', ' d ');
$result = Array ();
$t = Getcombinationtostring ($arr, 4);
Print_r ($t);

function getcombinationtostring ($arr, $m) {
if ($m ==1) {
return $arr;
}
$result = Array ();

$TMPARR = $arr;
unset ($tmpArr [0]);
for ($i =0; $i
$s = $arr [$i];
$ret = getcombinationtostring (Array_values ($TMPARR), ($m-1), $result);

foreach ($ret as $row) {
$result [] = $s. $row;
}
}

return $result;
}
?>

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