get_adjacent_post_link( string $format, string $link, bool $in_same_term = false, int[]|string $excluded_terms = '', bool $previous = true, string $taxonomy = 'category' ): string

2336function get_adjacent_post_link( $format, $link, $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {2337	if ( $previous && is_attachment() ) {2338		$post = get_post( get_post()->post_parent );2339	} else {2340		$post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );2341	}2342 2343	if ( ! $post ) {2344		$output = '';2345	} else {2346		$title = $post->post_title;2347 2348		if ( empty( $post->post_title ) ) {2349			$title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );2350		}2351 2352		/** This filter is documented in wp-includes/post-template.php */2353		$title = apply_filters( 'the_title', $title, $post->ID );2354 2355		$date = mysql2date( get_option( 'date_format' ), $post->post_date );2356		$rel  = $previous ? 'prev' : 'next';2357 2358		$string = '<a href="' . get_permalink( $post ) . '" rel="' . $rel . '">';2359		$inlink = str_replace( '%title', $title, $link );2360		$inlink = str_replace( '%date', $date, $inlink );2361		$inlink = $string . $inlink . '</a>';2362 2363		$output = str_replace( '%link', $inlink, $format );2364	}2365 2366	$adjacent = $previous ? 'previous' : 'next';2367 2368	/**2369	 * Filters the adjacent post link.2370	 *2371	 * The dynamic portion of the hook name, `$adjacent`, refers to the type2372	 * of adjacency, 'next' or 'previous'.2373	 *2374	 * Possible hook names include:2375	 *2376	 *  - `next_post_link`2377	 *  - `previous_post_link`2378	 *2379	 * @since 2.6.02380	 * @since 4.2.0 Added the `$adjacent` parameter.2381	 *2382	 * @param string         $output   The adjacent post link.2383	 * @param string         $format   Link anchor format.2384	 * @param string         $link     Link permalink format.2385	 * @param WP_Post|string $post     The adjacent post. Empty string if no corresponding post exists.2386	 * @param string         $adjacent Whether the post is previous or next.2387	 */2388	return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent );2389}