WP_Post|int|null $posts, WP_Query $query )
Filters the posts array before the query takes place.
Return a non-null value to bypass WordPress’ default post queries.
Filtering functions that require pagination information are encouraged to set the
max_num_pages properties of the WP_Query object, passed to the filter by reference. If WP_Query does not perform a database query, it will not have enough information to generate these values itself.
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$this->posts = apply_filters_ref_array( 'posts_pre_query', array( null, &$this ) );