wp_title 函數(shù)在 WordPress 中是用來顯示文章、頁面、分類等等等等標(biāo)題的一個(gè)函數(shù)，但在首頁索引，該函數(shù)將不顯示任何的東西。該函數(shù)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(gè)函數(shù)總是為忽視。
函數(shù)意義詳解
wp_title 函數(shù)用來顯示頁面的標(biāo)題，如在文章頁面，則顯示文章標(biāo)題；在分類頁面，則顯示分類名稱，但在首頁索引，該函數(shù)將不顯示任何的東西。
有點(diǎn)像 WordPress 中的 get_the_title 和 single_cat_title()這兩個(gè)函數(shù)的自適應(yīng)用法（自動(dòng)判斷是頁面、文章還是分類、歸檔、標(biāo)簽）。
函數(shù)聲明
有點(diǎn)長，希望您能耐心看一遍，哪怕只有那么一遍。
/** * 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 postif ( is_single() || ( is_home() && !is_front_page() ) || ( is_page() && !is_front_page() ) ) { $title = single_post_title( '', false );} // If there's a category or tagif ( is_category() || is_tag() ) { $title = single_term_title( '', false );} // If there's a taxonomyif ( 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 authorif ( is_author() ) { $author = get_queried_object(); $title = $author->display_name;} // If there's a post type archiveif ( is_post_type_archive() ) $title = post_type_archive_title( '', false ); // If there's a monthif ( is_archive() && !empty($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 . $my_day : '' );} // If there's a yearif ( is_archive() && !empty($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 searchif ( 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 pageif ( is_404() ) { $title = __('Page not found');} $prefix = '';if ( !empty($title) ) $prefix = " $sep "; // Determines position of the separator and direction of the breadcrumbif ( '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(shù)詳解
- $sep：分隔符；
- $echo：是否顯示；
- $seplocation：分隔符所在位置（左還是右，只接受'right',如果不是right自動(dòng)判定為左）
總結(jié)
WordPress 中相同功能的函數(shù)有很多，都是從基層到高級不斷的經(jīng)過封裝最后到達(dá)使用層的，當(dāng)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(shù)，如果我們懶的話我們可以直接使用最高級的那層函數(shù)，諸如本函數(shù) wp_title ，其實(shí)這個(gè)函數(shù)我們從源代碼來看， wp 替我們針對 分類、標(biāo)簽、文章、歸檔、作者、頁面等多種類型的頁面進(jìn)行了判斷，并根據(jù)不同頁面調(diào)用不同的標(biāo)題函數(shù)來達(dá)到目的。
如果有時(shí)間，您可以對下面幾個(gè)函數(shù)進(jìn)行深入研究一下，一遍更靈活的進(jìn)行seo
single_post_title 文章頁面提取標(biāo)題的函數(shù)
single_term_title tag（標(biāo)簽）、cat（分類）、日期、提取標(biāo)題的函數(shù) 類似于 single_cat_title()函數(shù)
get_queried_object 作者頁面提取對象的函數(shù)（對象中有作者名）
post_type_archive_title（）規(guī)檔等等提取標(biāo)題的函數(shù)
還等什么？
GO GO GO !
