Source

File: wp-includes/comment.php

function get_page_of_comment( $comment_ID, $args = array() ) {
	global $wpdb;

	$page = null;

	$comment = get_comment( $comment_ID );
	if ( ! $comment ) {
		return;
	}

	$defaults      = array(
		'type'      => 'all',
		'page'      => '',
		'per_page'  => '',
		'max_depth' => '',
	);
	$args          = wp_parse_args( $args, $defaults );
	$original_args = $args;

	// Order of precedence: 1. `$args['per_page']`, 2. 'comments_per_page' query_var, 3. 'comments_per_page' option.
	if ( get_option( 'page_comments' ) ) {
		if ( '' === $args['per_page'] ) {
			$args['per_page'] = get_query_var( 'comments_per_page' );
		}

		if ( '' === $args['per_page'] ) {
			$args['per_page'] = get_option( 'comments_per_page' );
		}
	}

	if ( empty( $args['per_page'] ) ) {
		$args['per_page'] = 0;
		$args['page']     = 0;
	}

	if ( $args['per_page'] < 1 ) {
		$page = 1;
	}

	if ( null === $page ) {
		if ( '' === $args['max_depth'] ) {
			if ( get_option( 'thread_comments' ) ) {
				$args['max_depth'] = get_option( 'thread_comments_depth' );
			} else {
				$args['max_depth'] = -1;
			}
		}

		// Find this comment's top-level parent if threading is enabled.
		if ( $args['max_depth'] > 1 && 0 != $comment->comment_parent ) {
			return get_page_of_comment( $comment->comment_parent, $args );
		}

		$comment_args = array(
			'type'       => $args['type'],
			'post_id'    => $comment->comment_post_ID,
			'fields'     => 'ids',
			'count'      => true,
			'status'     => 'approve',
			'parent'     => 0,
			'date_query' => array(
				array(
					'column' => "$wpdb->comments.comment_date_gmt",
					'before' => $comment->comment_date_gmt,
				),
			),
		);

		if ( is_user_logged_in() ) {
			$comment_args['include_unapproved'] = array( get_current_user_id() );
		} else {
			$unapproved_email = wp_get_unapproved_comment_author_email();

			if ( $unapproved_email ) {
				$comment_args['include_unapproved'] = array( $unapproved_email );
			}
		}

		/**
		 * Filters the arguments used to query comments in get_page_of_comment().
		 *
		 * @since 5.5.0
		 *
		 * @see WP_Comment_Query::__construct()
		 *
		 * @param array $comment_args {
		 *     Array of WP_Comment_Query arguments.
		 *
		 *     @type string $type               Limit paginated comments to those matching a given type.
		 *                                      Accepts 'comment', 'trackback', 'pingback', 'pings'
		 *                                      (trackbacks and pingbacks), or 'all'. Default 'all'.
		 *     @type int    $post_id            ID of the post.
		 *     @type string $fields             Comment fields to return.
		 *     @type bool   $count              Whether to return a comment count (true) or array
		 *                                      of comment objects (false).
		 *     @type string $status             Comment status.
		 *     @type int    $parent             Parent ID of comment to retrieve children of.
		 *     @type array  $date_query         Date query clauses to limit comments by. See WP_Date_Query.
		 *     @type array  $include_unapproved Array of IDs or email addresses whose unapproved comments
		 *                                      will be included in paginated comments.
		 * }
		 */
		$comment_args = apply_filters( 'get_page_of_comment_query_args', $comment_args );

		$comment_query       = new WP_Comment_Query();
		$older_comment_count = $comment_query->query( $comment_args );

		// No older comments? Then it's page #1.
		if ( 0 == $older_comment_count ) {
			$page = 1;

			// Divide comments older than this one by comments per page to get this comment's page number.
		} else {
			$page = ceil( ( $older_comment_count + 1 ) / $args['per_page'] );
		}
	}

	/**
	 * Filters the calculated page on which a comment appears.
	 *
	 * @since 4.4.0
	 * @since 4.7.0 Introduced the `$comment_ID` parameter.
	 *
	 * @param int   $page          Comment page.
	 * @param array $args {
	 *     Arguments used to calculate pagination. These include arguments auto-detected by the function,
	 *     based on query vars, system settings, etc. For pristine arguments passed to the function,
	 *     see `$original_args`.
	 *
	 *     @type string $type      Type of comments to count.
	 *     @type int    $page      Calculated current page.
	 *     @type int    $per_page  Calculated number of comments per page.
	 *     @type int    $max_depth Maximum comment threading depth allowed.
	 * }
	 * @param array $original_args {
	 *     Array of arguments passed to the function. Some or all of these may not be set.
	 *
	 *     @type string $type      Type of comments to count.
	 *     @type int    $page      Current comment page.
	 *     @type int    $per_page  Number of comments per page.
	 *     @type int    $max_depth Maximum comment threading depth allowed.
	 * }
	 * @param int $comment_ID ID of the comment.
	 */
	return apply_filters( 'get_page_of_comment', (int) $page, $args, $original_args, $comment_ID );
}