WP_Comment_Query::get_comments(): int|int[]|WP_Comment[]

Source

public function get_comments() {
	global $wpdb;

	$this->parse_query();

	// Parse meta query.
	$this->meta_query = new WP_Meta_Query();
	$this->meta_query->parse_query_vars( $this->query_vars );

	/**
	 * Fires before comments are retrieved.
	 *
	 * @since 3.1.0
	 *
	 * @param WP_Comment_Query $query Current instance of WP_Comment_Query (passed by reference).
	 */
	do_action_ref_array( 'pre_get_comments', array( &$this ) );

	// Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
	$this->meta_query->parse_query_vars( $this->query_vars );
	if ( ! empty( $this->meta_query->queries ) ) {
		$this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
	}

	$comment_data = null;

	/**
	 * Filters the comments data before the query takes place.
	 *
	 * Return a non-null value to bypass WordPress' default comment 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 comment count as an integer.
	 * - When `'ids' === $this->query_vars['fields']`, the filter should return
	 *   an array of comment IDs.
	 * - Otherwise the filter should return an array of WP_Comment objects.
	 *
	 * Note that if the filter returns an array of comment data, it will be assigned
	 * to the `comments` property of the current WP_Comment_Query instance.
	 *
	 * Filtering functions that require pagination information are encouraged to set
	 * the `found_comments` and `max_num_pages` properties of the WP_Comment_Query object,
	 * passed to the filter by reference. If WP_Comment_Query does not perform a database
	 * query, it will not have enough information to generate these values itself.
	 *
	 * @since 5.3.0
	 * @since 5.6.0 The returned array of comment data is assigned to the `comments` property
	 *              of the current WP_Comment_Query instance.
	 *
	 * @param array|int|null   $comment_data Return an array of comment data to short-circuit WP's comment query,
	 *                                       the comment count as an integer if `$this->query_vars['count']` is set,
	 *                                       or null to allow WP to run its normal queries.
	 * @param WP_Comment_Query $query        The WP_Comment_Query instance, passed by reference.
	 */
	$comment_data = apply_filters_ref_array( 'comments_pre_query', array( $comment_data, &$this ) );

	if ( null !== $comment_data ) {
		if ( is_array( $comment_data ) && ! $this->query_vars['count'] ) {
			$this->comments = $comment_data;
		}

		return $comment_data;
	}

	/*
	 * Only use the args defined in the query_var_defaults to compute the key,
	 * but ignore 'fields', 'update_comment_meta_cache', 'update_comment_post_cache' which does not affect query results.
	 */
	$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );
	unset( $_args['fields'], $_args['update_comment_meta_cache'], $_args['update_comment_post_cache'] );

	$key          = md5( serialize( $_args ) );
	$last_changed = wp_cache_get_last_changed( 'comment' );

	$cache_key   = "get_comments:$key:$last_changed";
	$cache_value = wp_cache_get( $cache_key, 'comment-queries' );
	if ( false === $cache_value ) {
		$comment_ids = $this->get_comment_ids();
		if ( $comment_ids ) {
			$this->set_found_comments();
		}

		$cache_value = array(
			'comment_ids'    => $comment_ids,
			'found_comments' => $this->found_comments,
		);
		wp_cache_add( $cache_key, $cache_value, 'comment-queries' );
	} else {
		$comment_ids          = $cache_value['comment_ids'];
		$this->found_comments = $cache_value['found_comments'];
	}

	if ( $this->found_comments && $this->query_vars['number'] ) {
		$this->max_num_pages = (int) ceil( $this->found_comments / $this->query_vars['number'] );
	}

	// If querying for a count only, there's nothing more to do.
	if ( $this->query_vars['count'] ) {
		// $comment_ids is actually a count in this case.
		return (int) $comment_ids;
	}

	$comment_ids = array_map( 'intval', $comment_ids );

	if ( $this->query_vars['update_comment_meta_cache'] ) {
		wp_lazyload_comment_meta( $comment_ids );
	}

	if ( 'ids' === $this->query_vars['fields'] ) {
		$this->comments = $comment_ids;
		return $this->comments;
	}

	_prime_comment_caches( $comment_ids, false );

	// Fetch full comment objects from the primed cache.
	$_comments = array();
	foreach ( $comment_ids as $comment_id ) {
		$_comment = get_comment( $comment_id );
		if ( $_comment ) {
			$_comments[] = $_comment;
		}
	}

	// Prime comment post caches.
	if ( $this->query_vars['update_comment_post_cache'] ) {
		$comment_post_ids = array();
		foreach ( $_comments as $_comment ) {
			$comment_post_ids[] = $_comment->comment_post_ID;
		}

		_prime_post_caches( $comment_post_ids, false, false );
	}

	/**
	 * Filters the comment query results.
	 *
	 * @since 3.1.0
	 *
	 * @param WP_Comment[]     $_comments An array of comments.
	 * @param WP_Comment_Query $query     Current instance of WP_Comment_Query (passed by reference).
	 */
	$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );

	// Convert to WP_Comment instances.
	$comments = array_map( 'get_comment', $_comments );

	if ( $this->query_vars['hierarchical'] ) {
		$comments = $this->fill_descendants( $comments );
	}

	$this->comments = $comments;
	return $this->comments;
}

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