wp_title 函數在 WordPress 中是用來顯示文章、頁面、分類等等等等標題的一個函數,但在首頁索引,該函數將不顯示任何的東西。該函數在 WordPress 官方主題中一直被使用,但目前很多定制的主題中這個函數總是為忽視。
函數意義詳解
wp_title 函數用來顯示頁面的標題,如在文章頁面,則顯示文章標題;在分類頁面,則顯示分類名稱,但在首頁索引,該函數將不顯示任何的東西。
有點像 WordPress 中的 get_the_title 和 single_cat_title()這兩個函數的自適應用法(自動判斷是頁面、文章還是分類、歸檔、標簽)。
函數聲明
有點長,希望您能耐心看一遍,哪怕只有那麼一遍。
/** * Display or retrieve page title for all areas of blog. * * By default, the page title will display the separator before the page title, * so that the blog title will be before the page title. This is not good for * title display, since the blog title shows up on most tabs and not what is * important, which is the page that the user is looking at. * * There are also SEO benefits to having the blog title after or to the 'right' * or the page title. However, it is mostly common sense to have the blog title * to the right with most browsers supporting tabs. You can achieve this by * using the seplocation parameter and setting the value to 'right'. This change * was introduced around 2.5.0, in case backwards compatibility of themes is * important. * * @since 1.0.0 * * @param string $sep Optional, default is '»'. How to separate the various items within the page title. * @param bool $display Optional, default is true. Whether to display or retrieve title. * @param string $seplocation Optional. Direction to display title, 'right'. * @return string|null String on retrieve, null when displaying. */ function wp_title($sep = '»', $display = true, $seplocation = '') { global $wpdb, $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_TITILE_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 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(); $tax = get_taxonomy( $term->taxonomy ); $title = single_term_title( $tax->labels->name . $t_sep, false ); } // If there's an author if ( is_author() ) { $author = get_queried_object(); $title = $author->display_name; } // If there's a post type archive if ( is_post_type_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 = $wp_locale->get_month(substr($m, 4, 2)); $my_day = intval(substr($m, 6, 2)); $title = $my_year . ( $my_month ? $t_sep . $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 phrase */ $title = sprintf(__('Search Results %1$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 "; // Determines position of the separator and direction of the breadcrumb if ( 'right' == $seplocation ) { // sep on right, so reverse the order $title_array = explode( $t_sep, $title ); $title_array = array_reverse( $title_array ); $title = implode( " $sep ", $title_array ) . $prefix; } else { $title_array = explode( $t_sep, $title ); $title = $prefix . implode( " $sep ", $title_array ); } $title = apply_filters('wp_title', $title, $sep, $seplocation); // Send it out if ( $display ) echo $title; else return $title; }
用法
<?php wp_title( $sep, $echo, $seplocation ); ?>
參數詳解
總結
WordPress 中相同功能的函數有很多,都是從基層到高級不斷的經過封裝最後到達使用層的,當然如果我們需要一些靈活用法的話,我們可以直接用中間那層的函數,如果我們懶的話我們可以直接使用最高級的那層函數,諸如本函數 wp_title ,其實這個函數我們從源代碼來看, wp 替我們針對 分類、標簽、文章、歸檔、作者、頁面等多種類型的頁面進行了判斷,並根據不同頁面調用不同的標題函數來達到目的。
如果有時間,您可以對下面幾個函數進行深入研究一下,一遍更靈活的進行seo
single_post_title 文章頁面提取標題的函數
single_term_title tag(標簽)、cat(分類)、日期、提取標題的函數 類似於 single_cat_title()函數
get_queried_object 作者頁面提取對象的函數(對象中有作者名)
post_type_archive_title()規檔等等提取標題的函數
還等什麼?
GO GO GO !