Instead of checking the value of Popular
on PHP side, you can filter directly your rows like this, and return the list of ID directly
SELECT ID FROM Products WHERE Popular = 1;
Then, you can use mysqli_fetch_array
to get the results as an array directly
while ($row = mysqli_fetch_array($result)) {
$Popular[] = $row;
}
print_r($Popular)
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solved How can I create an array with all rows from database