WP_Query::set_found_posts( array $q, string $limits )

Source

if ( ! $q['suppress_filters'] ) {
	/**
	 * Filters the array of retrieved posts after they've been fetched and
	 * internally processed.
	 *
	 * @since 1.5.0
	 *
	 * @param WP_Post[] $posts Array of post objects.
	 * @param WP_Query  $query The WP_Query instance (passed by reference).
	 */
	$this->posts = apply_filters_ref_array( 'the_posts', array( $this->posts, &$this ) );
}

/*
 * Ensure that any posts added/modified via one of the filters above are
 * of the type WP_Post and are filtered.
 */
if ( $this->posts ) {
	$this->post_count = count( $this->posts );

	/** @var WP_Post[] */
	$this->posts = array_map( 'get_post', $this->posts );

	if ( $q['cache_results'] ) {
		if ( $is_unfiltered_query && $unfiltered_posts === $this->posts ) {
			update_post_caches( $this->posts, $post_type, $q['update_post_term_cache'], $q['update_post_meta_cache'] );
		} else {
			$post_ids = wp_list_pluck( $this->posts, 'ID' );
			_prime_post_caches( $post_ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] );
		}
	}

	/** @var WP_Post */
	$this->post = reset( $this->posts );
} else {
	$this->post_count = 0;
	$this->posts      = array();
}

if ( ! empty( $this->posts ) && $q['update_menu_item_cache'] ) {
	update_menu_item_cache( $this->posts );
}

if ( $q['lazy_load_term_meta'] ) {
	wp_queue_posts_for_term_meta_lazyload( $this->posts );
}

return $this->posts;

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