What does php mean?

What does php mean? Php

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;

Reply to discussion (solution)

Http://www.cnblogs.com/janoyu/archive/2010/05/04/sourcejoy_com_php_other_syntax.html
You can refer to this article

Http://www.cnblogs.com/janoyu/archive/2010/05/04/sourcejoy_com_php_other_syntax.html
You can refer to this article
The situations I sent are different from those above.

If (defined ('WP _ USE_THEMES ') & WP_USE_THEMES) {if ('condition '){//...} elseif ('condition '){//...} //.....}

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.

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;

Different pages are displayed based on different results

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.
Understand!

if     ( is_404()            && $template = get_404_template()            ) :

Yes

if  ( is_404() ) ｛    $template = get_404_template();｝