pre_set_theme_mod_{$name} WordPress Filter Hook

The pre_set_theme_mod_{$name} hook is called before a theme mod is set. This hook allows you to modify the value of the theme mod before it is set. This can be useful if you need to ensure that a certain value is always set, or if you need to perform some validation on the value before it is set. Note that this hook only fires when the value of the theme mod is being changed; if the theme mod already has a value and you are simply trying to retrieve it, this hook will not fire.

apply_filters( "pre_set_theme_mod_{$name}", mixed $value, mixed $old_value ) #