wp_get_revision_ui_diff( WP_Post|int $post, int $compare_from, int $compare_to ): array|false

21function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {22	$post = get_post( $post );23	if ( ! $post ) {24		return false;25	}26 27	if ( $compare_from ) {28		$compare_from = get_post( $compare_from );29		if ( ! $compare_from ) {30			return false;31		}32	} else {33		// If we're dealing with the first revision...34		$compare_from = false;35	}36 37	$compare_to = get_post( $compare_to );38	if ( ! $compare_to ) {39		return false;40	}41 42	/*43	 * If comparing revisions, make sure we are dealing with the right post parent.44	 * The parent post may be a 'revision' when revisions are disabled and we're looking at autosaves.45	 */46	if ( $compare_from && $compare_from->post_parent !== $post->ID && $compare_from->ID !== $post->ID ) {47		return false;48	}49	if ( $compare_to->post_parent !== $post->ID && $compare_to->ID !== $post->ID ) {50		return false;51	}52 53	if ( $compare_from && strtotime( $compare_from->post_date_gmt ) > strtotime( $compare_to->post_date_gmt ) ) {54		$temp         = $compare_from;55		$compare_from = $compare_to;56		$compare_to   = $temp;57	}58 59	// Add default title if title field is empty.60	if ( $compare_from && empty( $compare_from->post_title ) ) {61		$compare_from->post_title = __( '(no title)' );62	}63	if ( empty( $compare_to->post_title ) ) {64		$compare_to->post_title = __( '(no title)' );65	}66 67	$return = array();68 69	foreach ( _wp_post_revision_fields( $post ) as $field => $name ) {70		/**71		 * Contextually filter a post revision field.72		 *73		 * The dynamic portion of the hook name, `$field`, corresponds to a name of a74		 * field of the revision object.75		 *76		 * Possible hook names include:77		 *78		 *  - `_wp_post_revision_field_post_title`79		 *  - `_wp_post_revision_field_post_content`80		 *  - `_wp_post_revision_field_post_excerpt`81		 *82		 * @since 3.6.083		 *84		 * @param string  $revision_field The current revision field to compare to or from.85		 * @param string  $field          The current revision field.86		 * @param WP_Post $compare_from   The revision post object to compare to or from.87		 * @param string  $context        The context of whether the current revision is the old88		 *                                or the new one. Either 'to' or 'from'.89		 */90		$content_from = $compare_from ? apply_filters( "_wp_post_revision_field_{$field}", $compare_from->$field, $field, $compare_from, 'from' ) : '';91 92		/** This filter is documented in wp-admin/includes/revision.php */93		$content_to = apply_filters( "_wp_post_revision_field_{$field}", $compare_to->$field, $field, $compare_to, 'to' );94 95		$args = array(96			'show_split_view' => true,97			'title_left'      => __( 'Removed' ),98			'title_right'     => __( 'Added' ),99		);100