Funktion in Parent Theme deaktivieren und nein aktivieren

function unicorn_custom_style_script() {
    wp_enqueue_style( 'dynamic-unicorn-css', admin_url('admin-ajax.php').'?action=dynamic_css');
}
add_action( 'wp_enqueue_scripts', 'unicorn_custom_style_script', 11 );


function dynamic_css() {
    require( get_template_directory().'/css/custom.css.php' );
    exit;
}
add_action('wp_ajax_dynamic_css', 'dynamic_css');
add_action('wp_ajax_nopriv_dynamic_css', 'dynamic_css');