wp_title 函数在 WordPress 中是用来显示文章、页面、分类等等等等标题的一个函数，但在首页索引，该函数将不显示任何的东西。该函数在 WordPress 官方主题中一直被使用，但目前很多定制的主题中这个函数总是为忽视。
函数意义详解wp_title 函数用来显示页面的标题，如在文章页面，则显示文章标题；在分类页面，则显示分类名称，但在首页索引，该函数将不显示任何的东西。有点像 WordPress 中的 get_the_title 和 single_cat_title()这两个函数的自适应用法（自动判断是页面、文章还是分类、归档、标签）。
函数声明有点长，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 ); ?>
参数详解
总结
WordPress 中相同功能的函数有很多，都是从基层到高级不断的经过封装最后到达使用层的，当然如果我们需要一些灵活用法的话，我们可以直接用中间那层的函数，如果我们懒的话我们可以直接使用最高级的那层函数，诸如本函数 wp_title ，其实这个函数我们从源代码来看， wp 替我们针对 分类、标签、文章、归档、作者、页面等多种类型的页面进行了判断，并根据不同页面调用不同的标题函数来达到目的。如果有时间，您可以对下面几个函数进行深入研究一下，一遍更灵活的进行seosingle_post_title 文章页面提取标题的函数single_term_title tag（标签）、cat（分类）、日期、提取标题的函数 类似于 single_cat_title()函数get_queried_object 作者页面提取对象的函数（对象中有作者名）post_type_archive_title（）规档等等提取标题的函数还等什么？GO GO GO !
