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WordPress中获取页面链接和标题的相关PHP函数用法解析_PHP

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Release: 2016-05-28 13:13:10
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get_permalink()(获取文章或页面链接)
get_permalink() 用来根据固定连接返回文章或者页面的链接。在获取链接时 get_permalink() 函数需要知道要获取的文章的 ID,如果在循环中则自动默认使用当前文章。

用法

get_permalink( $id, $leavename );
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参数

$id

(混合)(可选)文章或者页面的 ID(整数);还可以是文章对象。

默认值:在循环中自动调用当前的文章

$leavename

(布尔)(可选)转化成链接是是否忽略文章别名。如果设置成 True,那么将返回 http://www.example.com/%postname% 而不是 http://www.example.com/my-post-name

默认值:None

返回值

(字符串 | 布尔)成功获取链接则返回链接,失败则返回 False.

例子

根据 ID 获取文章或页面的链接:

<a href="<&#63;php echo get_permalink( 268 ); &#63;>">获取指定 ID 的文章或页面链接</a>
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循环中获取当前文章的链接:

<&#63;php echo get_permalink(); &#63;>
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根据页面标题获取页面链接:

<a href="<&#63;php echo esc_url( get_permalink( get_page_by_title( '留言板' ) ) ); &#63;>">留言板</a>
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其它

此函数位于:wp-includes/link-template.php

wp_title()(获取网页标题)
wp_title() 用来获取当前网页的标题,也就是 title 标签里边的内容。

wp_title() 能在不同的页面自动生成不同的标题(比如首页就是网站标题、文章页就是文章标题)。WordPress 官方的主题都在使用这个函数生成标题,但是在国内的主题中却总是被忽视(因为默认情况下这个函数对 SEO 并不是太好)。

我还是推荐使用这个函数调用标题,更加符合主题开发规范,如果你要让他变的更加符合 SEO,可以使用过滤器优化一下,本文结尾有优化方法。

用法

wp_title( $sep, $display, $seplocation );
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参数

$sep

(字符串)(可选)标题内容的分隔符,一般设置成 “|” 或者 “-”。

默认值:»(»)

$display

(布尔)(可选)是否直接打印标题,如果设置成 False 则返回标题,可以存储到变量里。

默认值:True(直接打印输出)

$seplocation

(字符串)(可选)分隔符所在位置,左边还是右边,如果传递 “right” 则为右边,其它任何内容都是左边。

默认值:空字符串(左边)

返回值

(字符串)如果 $display 参数设置成 False,才能返回标题的内容,根据不同的标题会返回不同的内容,默认情况下返回的内容是这样的:

  • 文章页:文章标题
  • 日期页:日期
  • 分类页:分类标题
  • 作者页:作者名字

如果你想更加详细的了解,可以阅读下边的函数源码:


/**
 * 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 '&raquo;'. 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 = '&raquo;', $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_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 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 = $wp_locale->get_month(substr($m, 4, 2));
    $my_day = intval(substr($m, 6, 2));
    $title = $my_year . ( $my_month &#63; $t_sep . $my_month : '' ) . ( $my_day &#63; $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 ";
 
  /**
   * Filter the parts of the page title.
   *
   * @since 4.0.0
   *
   * @param array $title_array 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 ) { // sep 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 );
  }
 
  /**
   * Filter 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;
 
}
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很显然默认情况下标题是比较简陋的,对 SEO 并不是很友好。

例子

<title><&#63;php wp_title( '|', true, 'right' ); &#63;></title>
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其它

标题可以使用 wp_title 过滤器定制,此函数位于:wp-includes/general-template.php

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