language_attributes( string $doctype = 'html' )
- Since
- 2.1.0, 4.3.0
- Source
wp-includes/general-template.php:4545
Description
Builds up a set of HTML attributes containing the text direction and language information for the page.
Compatibility
- WordPress
- since 4.3.0
- 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
$doctypestringoptional- The type of HTML document. Accepts 'xhtml' or 'html'. Default 'html'.Default:
'html'
Performance profile
How much work a call to language_attributes() 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
- 6
- Plugin surface
- None
- Called by
- 5
Reads stored settings via get_option(), 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. The body compiles to 6.
Nothing here hands control to plugin code.
5 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- optionoption read or write
get_option()one call below language_attributes() - hookthird-party callbacks
apply_filters()one call below language_attributes()
Further down the call graph this can also reach cache, serialize, query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
What one call costs · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost language_attributes() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6 | get_language_attributes() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 6 instructions, 6 executed per call, 0 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 · 1
- get_language_attributes()Gets the language attributes for the 'html' tag.
Used by · 5
- WP_REST_Widget_Types_Controller::render_legacy_widget_preview_iframe()Renders a page containing a preview of the requested Legacy Widget block.
- _wp_admin_html_begin()Prints out the beginning of the admin HTML header.
- display_header()Display installation header.
- handle_legacy_widget_preview_iframe()Intercepts any request with legacy-widget-preview in the query param and, if set, renders a page containing a preview of the requested Legacy Widget block.
- login_header()Outputs the login page header.
Source code
function language_attributes( $doctype = 'html' ) { echo get_language_attributes( $doctype );}Changelog
Introduced in 2.1.0. 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 6.8.8 tag, from
src/wp-includes/general-template.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.