## is_front_page is not working in my functions.php

Question

is_front_page() in the below code is not working… this function just doesn’t run when I’m on the front page, any idea why? am I doing something wrong?

function save_landing_page_slider()
{

if (isset($_GET['slider']) && is_front_page()) {$current_user_id = get_current_user_id();
$slider =$_GET['slider'];
update_field('user_landing_slider', $slider, 'user_'.$current_user_id);
}

}