sites_pre_query

Return a non-null value to bypass WordPress' default site queries. The expected return type from this filter depends on the value passed in the request query vars: - When $this->query_vars['count'] is set, the filter should return the site count as an integer. - When 'ids' === $this->query_vars['fields'], the filter should return an array of site IDs. - Otherwise the filter should return an array of WP_Site objects. Note that if the filter returns an array of site data, it will be assigned to the sites property of the current WP_Site_Query instance. Filtering functions that require pagination information are encouraged to set the found_sites and max_num_pages properties of the WP_Site_Query object, passed to the filter by reference. If WP_Site_Query does not perform a database query, it will not have enough information to generate these values itself.

// rejestracja funkcji zwrotnej
add_filter( 'sites_pre_query', 'twoja_funkcja' );

function twoja_funkcja($param_1) {
	// Twój kod
}