Question

this array contains positive and negative values in it.

$arr_pn = array( 1, -1, 2, 10,-15 );

My question is how to separate all negative values and store in an array and positive values in one more array?

Answer 1

$arr_p = array();
$arr_n = array(); 
foreach ($arr_pn as $val) {
    if ($val >= 0) {
        $arr_p[] = $val;
    }
    else {
        $arr_n[] = $val;
    }
}