WordPress文章页上一篇下一篇的链接显示标题

function get_adjacent_post_link( $format, $link, $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
	if ( $previous && is_attachment() ) {
		$post = get_post( get_post()->post_parent );
	} else {
		$post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );
	}

	if ( ! $post ) {
		$output = '';
	} else {
		$title = $post->post_title;

		if ( empty( $post->post_title ) ) {
			$title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );
		}

		/** This filter is documented in wp-includes/post-template.php */
		$title = apply_filters( 'the_title', $title, $post->ID );

		$date = mysql2date( get_option( 'date_format' ), $post->post_date );
		$rel  = $previous ? 'prev' : 'next';

		$string = '<a href="' . get_permalink( $post ) . '" rel="' . $rel . '">';
		$inlink = str_replace( '%title', $title, $link );
		$inlink = str_replace( '%date', $date, $inlink );
		//$inlink = $string . $inlink . '</a>';	//注释或删除此行
		//Start-添加代码
		if($previous)
		{
			$inlink = $string . $title .$inlink . '</a>';
		}else{
			$inlink = $string . $inlink . $title. '</a>';
		}
		//End-添加代码
		$output = str_replace( '%link', $inlink, $format );
	}
	$adjacent = $previous ? 'previous' : 'next';
	return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent );
}

$inlink .= "<p><a href='{$post->guid}'>{$title}</a></p>";