multi insert sql.php

<?php
//case(3): array_push($fetch_array, [&$response->vouchers,"select * from vouchers_config;"]); break;

function fetchdb($data){
    global $response, $conn; 
    $query = "";
    for ($i=0; $i < count($data); $i++) { 
        $query .= $data[$i][1];
    }
    if (mysqli_multi_query($conn, $query)) {
        $column = 0;
        do {
            $data[$column][0] = [];
            if ($result = mysqli_store_result($conn)) {
                while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
                    array_push($data[$column][0], $row);
                }
                mysqli_free_result($result);
                $column++;
            }

        } while (mysqli_next_result($conn));
    }
}

fetchdb($fetch_array);