store_result() and get_result() in mysql returns false

by

Use get_result() instead of store_result(), and then use the result object’s num_rows:

$a->execute();
$res = $a->get_result();
if ($res->num_rows > 0) {
    while ($row = $res->fetch_assoc()) {
        $results[] = $row;
    }
    return $results;
} else {
    return false;
}

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