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Filter Hooks are very powerful features of WordPress that provide huge amount of flexibility for modifying WordPress, including custom themes and plugins. In this tutorial, I'm just showing a simple example that demonstrates what a filter hook does. There are four core functions that use when working with filters: add_filter(): Used for adding new custom filter. remove_filter(): used for removing an already registered filter. apply_filters(): runs the provided data through the specified filter. has_filter(): checks whether a specific filter has been registered or not.