php arr -5 -9 15 11 -4 -10 foreach arr as key value if value sumM valu

<?php
$arr = [2, -5, -9, 15, 11, -4, 7, 1, -10];
foreach ($arr as $key => $value){
    if ($value<0){
        $sumM +=$value;
    }else {
        $sumP+=$value;
    }
}
echo $sumM.'<br>';
echo $sumP;