为什么is_singular条件在functions.php wordpress的过滤器挂钩中不起作用？

Question

我正在尝试使用is_singular函数的条件逻辑帮助检查和设置内容。但这是行不通的。我已经为单发布循环创建了三个文件，single.php，single-post1.php，single-post2.php。 single.php带有默认的post url参数。 single-post1.php附带了/?L=2的额外提示，例如

  

http://localhost/wordpress/african-immigrant-climbs-4-floors-with-his-bare-hands-to-save-a-4-year-old-boy/?L=2

，因此也适用于single-post2.php。但是现在当我想通过检查is_singular函数加载single-post1.php文件时，它不起作用，仅在其他情况下起作用。有没有更好的主意来应用这种情况。将非常感谢您的帮助。使用的代码如下...

function bootstrap_wp_link_pages($wp_links){


  global $post;

  // Generate current page base url without pagination.
  $post_base = trailingslashit( get_site_url(null, $post->post_name) );
  $wp_links = trim(str_replace(array('<p>Pages: ', '</p>'), '', $wp_links));
  // Get out of here ASAP if there is no paging.
  if ( empty($wp_links) )
    return '';
  // Split on spaces
  $splits = explode(' ', $wp_links );
  $links = array();
  $current_page = 1;
  // Since links are now split up such that <a and href=".+" are seperate...
  // loop over split array and correct links.
  foreach( $splits as $key => $split ){
    if( is_numeric($split) ) {
      $links[] = $split;
      $current_page = $split;
    } else if ( strpos($split, 'href') === false ) {
      $links[] = $split . ' ' . $splits[$key + 1];
    }
  }
  $num_pages = count($links);
  // Output pagination
  $output = '';
  $output .= '<ul class="pagination">';

  if ( $current_page == $num_pages ) 
  {
    $output .= '<li class="disabled"><a> </a>';
  }

  elseif(is_singular('post1'))
  {
    $output .= '<li><a href="' . $post_base . ($current_page + 1) . '/?L=2">';
    $output .= 'Next Page</a></li>';

  }

  elseif(is_singular('post2') )
  {
    $output .= '<li><a href="' . $post_base . ($current_page + 1) . '/?L=3">';
    $output .= 'Next Page</a></li>';
  } // end the li. No reason to duplicated this in both conditionals.


else
  {
    $output .= '<li><a href="' . $post_base . ($current_page + 1) . '/?L=4">';
    $output .= 'Next Page</a></li>';
  } // end the li. No reason to duplicated this in both conditionals.

  $output .= '</ul>';


  return $output;

}

add_filter('wp_link_pages', 'bootstrap_wp_link_pages');