How to use Hook Filter

Introduction: What are hooks?

Hooks in WordPress essentially allow you to change or add code without editing core files. They are used extensively throughout WordPress and Tourfic and are very useful for developers.

Using filter hooks

Filter hooks are called throughout are code using apply_filter( 'filter_name', $variable );. To manipulate the passed variable, you can do something like the following:

add_filter( 'filter_name', 'your_function_name' );

function your_function_name( $variable ) {
// Your code
return $variable;
}

With filters, you must return a value.