sum values from db with array_sum() stuck at 3 loop - loops

Question

after couple of days i finally got some values from 1st and 2nd line but after that at 4th line i got stacked and nothing works.
in need to get data from db where:
obrat | memb | tab3. | history
| member1 | 0. | 10
200 | member2 | member1. | 3
100 | member3 | member1. | 4
so if i will select from tab3 users which have my memb i need to sum their obrat and history. And doo the same think with them - select from tab3 where names are member1 and member2 and sum that.
my code:
while ($row = $resulto->fetch_assoc()) {
$memb2 = $row['memb'];
// second line member sel.
$resulto2 = $mysqli->query("SELECT * FROM users WHERE tab3='$memb2' ") or die($mysqli->error());
//pokud druhá linie
if ($resulto2->num_rows > 0) {
while ($row2 = $resulto2->fetch_assoc()) {
$memb3 = $row2['memb'];
} // should be 3. line
// get numbers from 2. line
$resulto2 = $mysqli->query("SELECT * FROM users WHERE tab3='$memb2' ") or die($mysqli->error());
$d = 0;
$rows2 = array();
$rows3c = array();
while ($rowd = $resulto2->fetch_array()) {
array_push($rows2, $rowd['obrat']);
array_push($rows3c, $rowd['history']);
}
$array2 = array_sum($rows2);
$count3 = array_sum($rows3c);
}
}
//end / get values first line
$resulto = $mysqli->query("SELECT * FROM users WHERE tab3='$memb' ") or die($mysqli->error());
$d = 0;
$rows = array();
$rows2c = array();
while ($rowd = $resulto->fetch_array()) {
array_push($rows, $rowd['obrat']);
array_push($rows2c, $rowd['history']);
}
$array = array_sum($rows);
$count2 = array_sum($rows2c);
}
some idea where is the problem?

Answer 1

or next way iam trying to :
$resulto2 = $mysqli->query("SELECT * FROM users WHERE tab3='$memb' ") or die($mysqli->error());
if ($resulto2->num_rows > 0) {
while ($row2 = $resulto2->fetch_assoc()) {
$memb2 = $row2['memb'];
$resulto2a = $mysqli->query("SELECT * FROM users WHERE tab3='$memb2' ") or die($mysqli->error());
while ($row2a = $resulto2a->fetch_assoc()) {
$memb3 = " OR memb='".$row2a['memb']."'";
//here i need to get one value which is sum from all users selecting
}
}