wp_title

wp_title: 这个函数生成和检索当前页面的标题。标题是根据当前视图、文章类型和其他背景生成的。

为博客的所有区域显示或检索页面标题。

默认情况下，页面标题将显示页面标题之前的分隔符，因此博客标题将在页面标题之前。这对于标题显示来说并不理想，因为博客标题会显示在大多数标签上，而不是重要的东西，也就是用户正在看的页面。

将博客标题放在页面标题的后面或右边也有SEO方面的好处。然而，在大多数浏览器支持标签的情况下，将博客标题放在右边是最常识的做法。你可以通过使用seplocation参数并将其值设置为”右”来实现这一点。这一变化是在2.5.0左右引入的，以防主题的向后兼容性很重要。

function wp_title( $sep = '»', $display = true, $seplocation = '' ) {
	global $wp_locale;

	$m        = get_query_var( 'm' );
	$year     = get_query_var( 'year' );
	$monthnum = get_query_var( 'monthnum' );
	$day      = get_query_var( 'day' );
	$search   = get_query_var( 's' );
	$title    = '';

	$t_sep = '%WP_TITLE_SEP%'; // Temporary separator, for accurate flipping, if necessary.

	// If there is a post.
	if ( is_single() || ( is_home() && ! is_front_page() ) || ( is_page() && ! is_front_page() ) ) {
		$title = single_post_title( '', false );
	}

	// If there's a post type archive.
	if ( is_post_type_archive() ) {
		$post_type = get_query_var( 'post_type' );
		if ( is_array( $post_type ) ) {
			$post_type = reset( $post_type );
		}
		$post_type_object = get_post_type_object( $post_type );
		if ( ! $post_type_object->has_archive ) {
			$title = post_type_archive_title( '', false );
		}
	}

	// If there's a category or tag.
	if ( is_category() || is_tag() ) {
		$title = single_term_title( '', false );
	}

	// If there's a taxonomy.
	if ( is_tax() ) {
		$term = get_queried_object();
		if ( $term ) {
			$tax   = get_taxonomy( $term->taxonomy );
			$title = single_term_title( $tax->labels->name . $t_sep, false );
		}
	}

	// If there's an author.
	if ( is_author() && ! is_post_type_archive() ) {
		$author = get_queried_object();
		if ( $author ) {
			$title = $author->display_name;
		}
	}

	// Post type archives with has_archive should override terms.
	if ( is_post_type_archive() && $post_type_object->has_archive ) {
		$title = post_type_archive_title( '', false );
	}

	// If there's a month.
	if ( is_archive() && ! empty( $m ) ) {
		$my_year  = substr( $m, 0, 4 );
		$my_month = substr( $m, 4, 2 );
		$my_day   = (int) substr( $m, 6, 2 );
		$title    = $my_year .
			( $my_month ? $t_sep . $wp_locale->get_month( $my_month ) : '' ) .
			( $my_day ? $t_sep . $my_day : '' );
	}

	// If there's a year.
	if ( is_archive() && ! empty( $year ) ) {
		$title = $year;
		if ( ! empty( $monthnum ) ) {
			$title .= $t_sep . $wp_locale->get_month( $monthnum );
		}
		if ( ! empty( $day ) ) {
			$title .= $t_sep . zeroise( $day, 2 );
		}
	}

	// If it's a search.
	if ( is_search() ) {
		/* translators: 1: Separator, 2: Search query. */
		$title = sprintf( __( 'Search Results %1$s %2$s' ), $t_sep, strip_tags( $search ) );
	}

	// If it's a 404 page.
	if ( is_404() ) {
		$title = __( 'Page not found' );
	}

	$prefix = '';
	if ( ! empty( $title ) ) {
		$prefix = " $sep ";
	}

	/**
	 * Filters the parts of the page title.
	 *
	 * @since 4.0.0
	 *
	 * @param string[] $title_array Array of parts of the page title.
	 */
	$title_array = apply_filters( 'wp_title_parts', explode( $t_sep, $title ) );

	// Determines position of the separator and direction of the breadcrumb.
	if ( 'right' === $seplocation ) { // Separator on right, so reverse the order.
		$title_array = array_reverse( $title_array );
		$title       = implode( " $sep ", $title_array ) . $prefix;
	} else {
		$title = $prefix . implode( " $sep ", $title_array );
	}

	/**
	 * Filters the text of the page title.
	 *
	 * @since 2.0.0
	 *
	 * @param string $title       Page title.
	 * @param string $sep         Title separator.
	 * @param string $seplocation Location of the separator ('left' or 'right').
	 */
	$title = apply_filters( 'wp_title', $title, $sep, $seplocation );

	// Send it out.
	if ( $display ) {
		echo $title;
	} else {
		return $title;
	}
}