Localhost运行，服务器未运行。 PHP移动代码[重复]

My computer have localhost, my code run not problem. And i install my website a server, codes not run. Please help me.

This code ( /backend/operation.php )

if (isset($_GET['ProjectsMove'])) {
    $ProjectsMove = "INSERT INTO okprojects SELECT * FROM projects WHERE projects_id = '{$_GET['projects-id']}'";
    $ProjectsDelete = "DELETE FROM projects WHERE projects_id = '{$_GET['projects-id']}'";
    $ProjectsMoveSQL = mysqli_query($dbconnect, $ProjectsMove);
    $ProjectsDeleteSQL = mysqli_query($dbconnect, $ProjectsDelete);
    if ($ProjectsMoveSQL) {
        header("Location:../Projects.php");
    }
}

Google chrome : www.aaa.com/backend/operation?ProjectsMove=1&projects-id=17

Front End;

<td>
    <a onclick="return confirm('Proje Tamamlandı mı?')" href="backend/operation?ProjectsMove=1&projects-id=<?php echo $projecek['projects_id'] ?>">
        <i class="far fa-thumbs-up"></i>
    </a>
</td>

</div>