What is WordPress Hook: pre_get_terms
The pre_get_terms hook in WordPress is used to modify the parameters of the get_terms function before it is executed. This allows developers to alter the taxonomy query parameters before the terms are retrieved from the database.
Understanding the Hook: pre_get_terms
The pre_get_terms hook is located within the pre_get_posts action, which is triggered before the main WordPress query is executed. This means that any modifications made to the taxonomy query parameters using this hook will affect the terms retrieved by the get_terms function.
Hook Parameters (if applicable): pre_get_terms
The pre_get_terms hook accepts a single parameter, which is an instance of the WP_Tax_Query object. This object contains the taxonomy query parameters that can be modified using the hook.
Hook Doesn’t Work: pre_get_terms
If the pre_get_terms hook doesn’t seem to be working, it could be due to incorrect usage or conflicts with other plugins or themes. It’s important to double-check the code for any syntax errors or conflicting modifications to the same query parameters.
Best Practices & Usage Notes (if applicable): pre_get_terms
When using the pre_get_terms hook, it’s important to be mindful of the impact of the modifications on the overall query. Making excessive or unnecessary changes to the taxonomy query parameters can lead to unexpected results or performance issues. It’s best to use this hook sparingly and with a clear understanding of its effects.
pre_get_terms Usage Example: pre_get_terms
“`php
function custom_pre_get_terms( $query ) {
if ( is_admin() ) {
$query->set( ‘hide_empty’, 0 );
}
}
add_action( ‘pre_get_terms’, ‘custom_pre_get_terms’ );
“`
In this example, the pre_get_terms hook is used to modify the hide_empty parameter of the taxonomy query to ensure that empty terms are included when the query is executed in the WordPress admin area.