php这种写法什么意思？
<br />
if ( defined('WP_USE_THEMES') && WP_USE_THEMES ) :<br />
$template = false;<br />
if ( is_404() && $template = get_404_template() ) :<br />
elseif ( is_search() && $template = get_search_template() ) :<br />
elseif ( is_front_page() && $template = get_front_page_template() ) :<br />
elseif ( is_home() && $template = get_home_template() ) :<br />
elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) :<br />
elseif ( is_tax() && $template = get_taxonomy_template() ) :<br />
elseif ( is_attachment() && $template = get_attachment_template() ) :<br />
remove_filter('the_content', 'prepend_attachment');<br />
elseif ( is_single() && $template = get_single_template() ) :<br />
elseif ( is_page() && $template = get_page_template() ) :<br />
elseif ( is_category() && $template = get_category_template() ) :<br />
elseif ( is_tag() && $template = get_tag_template() ) :<br />
elseif ( is_author() && $template = get_author_template() ) :<br />
elseif ( is_date() && $template = get_date_template() ) :<br />
elseif ( is_archive() && $template = get_archive_template() ) :<br />
elseif ( is_comments_popup() && $template = get_comments_popup_template() ) :<br />
elseif ( is_paged() && $template = get_paged_template() ) :<br />
else :<br />
$template = get_index_template();<br />
endif;<br />
/**<br />
* Filter the path of the current template before including it.<br />
*<br />
* @since 3.0.0<br />
*<br />
* @param string $template The path of the template to include.<br />
*/<br />
if ( $template = apply_filters( 'template_include', $template ) )<br />
include( $template );<br />
return;<br />
endif;<br />
