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twentytwentyone_the_html_classes(): void

Since
Twenty Twenty-One 1.0
Source
wp-content/themes/twentytwentyone/functions.php:578
Calculates classes for the main element.

Compatibility

WordPress
since Twenty Twenty-One 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.

Return value

void

Performance profile

How much work a call to twentytwentyone_the_html_classes() 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
Trivial

Touches nothing outside its own arguments.

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
7–13

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 14.

Plugin surface
1 hook

Third-party callbacks on 'twentytwentyone_html_classes' run inside this call, and their cost is not bounded by anything here.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

  • hookthird-party callbacksapply_filters()called directly

Further down the call graph this can also reach option, 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 · 2 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost twentytwentyone_the_html_classes() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always7apply_filters()
always13apply_filters(), esc_attr()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 14 instructions, 7–13 executed per call, 1 branch. 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.

Hooks and filters fired · 1

One hook fires while twentytwentyone_the_html_classes() runs, in this order:

  1. apply_filters( twentytwentyone_html_classes )filterline 586 (+8 into the body)

    Filters the classes for the main element.

Uses · 2

Source code

View on Trac View on GitHub 

function twentytwentyone_the_html_classes() {	/**	 * Filters the classes for the main <html> element.	 *	 * @since Twenty Twenty-One 1.0	 *	 * @param string $classes The list of classes. Default empty string.	 */	$classes = apply_filters( 'twentytwentyone_html_classes', '' );	if ( ! $classes ) {		return;	}	echo 'class="' . esc_attr( $classes ) . '"';}

Changelog

Introduced in Twenty Twenty-One 1.0. Unchanged from 6.7.7 through 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 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/twentytwentyone/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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