【PHP】下らねぇ質問はID出して書き込みやがれ 88

>>866
$data = array('1','2','3','4','5');
print_r (combinations3( $data, 3));

function combinations3( $array , $num ) {
$n = count($array);
$x = (1 << $num ) -1;
$ret = array();
while ( ! ($x & ~( (1 << $n ) -1 ))){
$ret[] = arrayset($x,$array,$n);
$x =nextp($x);
}
return $ret;
}
function nextp($x) {
$s =$x & -$x;
$r = $x + $s;
$n = $r & -$r;
return ($r | ((floor($n/$s )>>1)-1));
}
function arrayset($x,$array,$n){
$r = array();
for( $i =1;$i<= $n;$i++){
if($x & 1) $r[] = $array[$i-1];
$x = $x >>1;
}
return $r;
}