表名是变量时如何从MySQL更新

Question

我想更新表名称为变量的表。我可以很好地更新表，但是当我尝试将其设置为变量时会遇到问题。我可能只是不太了解语法。

bing

我也尝试过使用escape_string

if ($_SERVER['REQUEST_METHOD'] == 'POST'){

$table = "settings";

    $tr_title = $_POST['tr_title'];
    $tr_slogan = $_POST['tr_slogan'];
    $tr_signin = $_POST['tr_signin'];
    $tr_makeacall = $_POST['tr_makeacall'];

$statment = $connect->prepare(
    'UPDATE $table SET
    tr_title = :tr_title,
    tr_slogan = :tr_slogan,
    tr_signin = :tr_signin,
    tr_makeacall = :tr_makeacall
    ');

    $statment->execute(array(
        ':tr_title' => $tr_title,
        ':tr_slogan' => $tr_slogan,
        ':tr_signin' => $tr_signin,
        ':tr_makeacall' => $tr_makeacall
        ));

    header('Location: ' . $_SERVER['HTTP_REFERER']);

}

我很确定我的语法即将结束。