WordPress中获取页面链接和标题的相关PHP函数用法

get_permalink( $id, $leavename );

<a href="<?php echo get_permalink( 268 ); ?>">获取指定 ID 的文章或页面链接</a>

<?php echo get_permalink(); ?>

<a href="<?php echo esc_url( get_permalink( get_page_by_title( '留言板' ) ) ); ?>">留言板</a>

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

/
  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 mon 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 patibility 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 $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 aurate 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 ? $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 ";
 
  /
    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;
 
}

<title><?php wp_title( '|', true, 'right' ); ?></title>