ohctech_p8/delete_task_header.php

<?php
include ('includes/config/config.php');
$query = "";
if (!empty($_REQUEST['flex_task_id'])) {
    $query = " delete from task_header_master where task_id_header = '" . $_REQUEST['flex_task_id'] . " '   ";

    if (!$result = @mysqli_query($conn, $query)) {
        echo json_encode("FAILURE");
        die(mysqli_error($conn));

    } else {
        echo json_encode("SUCCESS");
    }
}