What does php mean? Solution

What does php mean? If & nbsp; (& nbsp; defined ('WP _ USE_THEMES ') & nbsp; & amp; & nbsp; WP_USE_THEMES & nbsp;) & nbsp ;: $ template & nbsp ;=& nbsp; false what does php mean?

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

Share with php:
------ Solution --------------------
It is very simple. in front of &, it is judgment-> true/false, followed by assignment-> must be true.
Because of the shortcut, if the first half of & is false, you do not need to judge the second half.
That is to say, only when the first half of the segment is true can the latter be assigned a value.
Because the purpose of the program is to assign values, the actual statement is not required after the colon.
------ Solution --------------------
It can be understood
It's also a triplicate method.
$ Template = (is_404 ())? Get_404_template (): false;
Or
If (is_404 () $ template = get_404_template ();
Else $ template = false;