getSFC.php

<?php
if (isset($_REQUEST['mfc_id'])) { //change to $_POST
    
    //$mfcId =  filter_input(INPUT_POST, $_REQUEST['mfc_id'], FILTER_DEFAULT);
    $sfcId=$_REQUEST['mfc_id'];
    
    include_once 'globalConsts.php';
    $response = array();

    mysql_connect(SERVER_ADDRESS, USER, PASS);


    if (mysqli_connect_errno()) {
        //echo "Could not connect to database";

        $response["success"] = 0;
        $response["message"] = "Failed to connect to database";
        echo json_encode($response);
        exit;
    }

    mysql_select_db(DATABASE);
    $sql = "SELECT * FROM sub_food_category WHERE MFC_ID='".$sfcId."'";
    $result = mysql_query($sql);

    if (mysql_num_rows($result)) {
        $response["success"] = 1;

        $items = array();

        while ($row = mysql_fetch_array($result)) {
            $item = array();
            $item['id'] = $row['SFC_ID'];
            $item['sfc_val'] = $row['SFC_Name'];
            array_push($items, $item);
        }

        $response['items'] = $items;

        echo json_encode($response);
    }
}