Warp two row with a class after query - php

Question

I want to warp every two row with a class. So I saw some guideline from here and googling and found foreach array_chunk to do this. And I tried as below which can't display any result. Without foreach its work well. Were is my wrong here please?
In the above picture that I want to do; my every two category warp with a class. And add a divider after each top category.
Here is my tried:
echo '<ul class="dropdown-menu dropdown-menu-large row">';
$sql = "SELECT id,name FROM main_cata ORDER BY id ASC";
$execute = $dbh->query("$sql");
$rowcount = $execute->num_rows ;
$row = $dbh->query($sql) ;
while ($row = $execute->fetch_assoc()) {
foreach (array_chunk($row, 2, true) as $array){
echo'<li class="col-sm-3">';
foreach($array as $rows){
echo '<ul><li class="dropdown-header">'.$rows->name.'</li>';
$sql2 = "SELECT id,name,page FROM catagory WHERE m_cata = '".$rows->id."' ORDER BY id ASC";
$execute2 = $dbh->query("$sql2");
$rowcount2 = $execute2->num_rows ;
$row = $dbh->query($sql) ;
while ($row = $execute2->fetch_assoc()) {
$cid = $row['id'];
$cname = $row['name'];
$page = $row['page'];
echo '<li>'.$cname.'</li>';
}
echo '<li class="divider"></li></ul>';
}
echo '</li>';
}
}
echo '</ul>';

Answer 1

while ($row = $execute->fetch_assoc()) {
fetch_assoc returns 1 row (id, name) from the query, then you are using the result and spliting in 2 (https://secure.php.net/manual/pt_BR/mysqli-result.fetch-assoc.php), What you can do is, make a counter instead of the array chunk that resets every time it reachs 2.
foreach (array_chunk($row, 2, true) as $array){
The content of $row is, for example, array('id' => 1, 'name' => 'Category 1').
foreach($array as $rows){
You are iterating again without needing to.
A simple version:
counter = 0;
echo "<ul>";
while (row = execute->fetch_assoc()) {
if (counter == 0) {
echo "init li";
}
echo "subinit li";
get subcategories
while (row2 = execute2->fetch_assoc()) {
print content
}
echo "subend li";
if (counter == 2) {
counter == 0;
echo "end li";
} else {
counter++;
echo "divider";
}
}
echo "</ul>";