WordPress update_option() not working with a variable

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I’m trying to create a settings page for my WordPress plugin, and the update_option() method isn’t working as expected. 

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $tt = $_POST['theme_title'];
    echo $tt;
    update_option('theme_title', $tt);
}

Using the code above, if I submit the form with a new value for theme_title, the page prints out the new value. update_option() even returns “1”. But the new value isn’t saved in the database.

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However, replacing with update_option('theme_title', 'test') results in the value “test” being saved in the database.

How is it possible that the method only accepts an explicit string and not a variable?

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