twentytwelve_body_class( array $classes ): array
- Since
- Twenty Twelve 1.0
- Source
wp-content/themes/twentytwelve/functions.php:617
Description
Extends the default WordPress body class to denote:
- Using a full-width layout, when no active widgets in the sidebar or full-width template.
- Front Page template: thumbnail in use and number of sidebars for widget areas.
- White or empty background color to change the layout and spacing.
- Custom fonts enabled.
- Single or multiple authors.
Compatibility
- WordPress
- since Twenty Twelve 1.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$classesarray- Existing class values.
Return value
array- Filtered class values.
Performance profile
How much work a call to twentytwelve_body_class() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Moderate
- Scaling
- Constant
- Instructions
- 28–59
- Plugin surface
- None
- Called by
- 0
Reads stored settings via get_transient(), cached per request but not free on a cold cache.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 62.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()one call below twentytwelve_body_class() - transienttransient
get_transient()one call below twentytwelve_body_class()
Further down the call graph this can also reach option, query, cache and serialize. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 6 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost twentytwelve_body_class() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!is_active_sidebar() && !is_page_template() | 28–38 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), wp_style_is(), is_multi_author() |
is_active_sidebar() && !is_page_template() | 30–42 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), is_page_template(), wp_style_is(), is_multi_author() |
!is_active_sidebar() && is_page_template() | 37–49 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), has_post_thumbnail(), is_active_sidebar(), wp_style_is(), is_multi_author() |
is_page_template() | 39–53 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), is_page_template(), has_post_thumbnail(), is_active_sidebar(), wp_style_is(), is_multi_author() |
is_page_template() | 41–55 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), has_post_thumbnail(), is_active_sidebar(), is_active_sidebar(), wp_style_is(), is_multi_author() |
is_active_sidebar() && is_page_template() | 43–59 | get_background_color(), get_background_image(), is_active_sidebar(), is_page_template(), is_page_template(), has_post_thumbnail(), is_active_sidebar(), is_active_sidebar(), wp_style_is(), is_multi_author() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 62 instructions, 28–59 executed per call, 11 branches. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 7
- get_background_color()Retrieves value for custom background color.
- get_background_image()Retrieves background image for custom background.
- is_active_sidebar()Determines whether a sidebar contains widgets.
- is_page_template()Determines whether the current post uses a page template.
- has_post_thumbnail()Determines whether a post has an image attached.
- wp_style_is()Checks whether a CSS stylesheet has been added to the queue.
- is_multi_author()Determines whether this site has more than one author.
Source code
function twentytwelve_body_class( $classes ) { $background_color = get_background_color(); $background_image = get_background_image(); if ( ! is_active_sidebar( 'sidebar-1' ) || is_page_template( 'page-templates/full-width.php' ) ) { $classes[] = 'full-width'; } if ( is_page_template( 'page-templates/front-page.php' ) ) { $classes[] = 'template-front-page'; if ( has_post_thumbnail() ) { $classes[] = 'has-post-thumbnail'; } if ( is_active_sidebar( 'sidebar-2' ) && is_active_sidebar( 'sidebar-3' ) ) { $classes[] = 'two-sidebars'; } } if ( empty( $background_image ) ) { if ( empty( $background_color ) ) { $classes[] = 'custom-background-empty'; } elseif ( in_array( $background_color, array( 'fff', 'ffffff' ), true ) ) { $classes[] = 'custom-background-white'; } } // Enable custom font class only if the font CSS is queued to load. if ( wp_style_is( 'twentytwelve-fonts', 'queue' ) ) { $classes[] = 'custom-font-enabled'; } if ( ! is_multi_author() ) { $classes[] = 'single-author'; } return $classes;}Changelog
Introduced in Twenty Twelve 1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-content/themes/twentytwelve/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.