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WP_Theme_JSON::get_block_classes( array $style_nodes ): string

Since
5.8.0, 5.9.0, 6.1.0
Source
wp-includes/class-wp-theme-json.php:1595
Converts each style section into a list of rulesets containing the block styles to be appended to the stylesheet.

Description

See glossary at https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax

For each section this creates a new ruleset such as:

block-selector { style-property-one: value; }

Compatibility

WordPress
since 6.1.0
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

$style_nodesarray
Nodes with styles.

Return value

string
The new stylesheet.

Performance profile

How much work a call to WP_Theme_JSON::get_block_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
Scales with input

The body loops, so the work grows with what you pass in.

Instructions
5–6

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

Plugin surface
None

Nothing here hands control to plugin code.

Called by
1

1 place in core call this, so the cost is paid more often than your own code shows.

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 WP_Theme_JSON::get_block_classes() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always5–6none

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, 5–6 executed per call, 3 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

  • static::get_styles_for_block()

Used by · 1

Source code

View on Trac View on GitHub 

	protected function get_block_classes( $style_nodes ) {		$block_rules = ''; 		foreach ( $style_nodes as $metadata ) {			if ( null === $metadata['selector'] ) {				continue;			}			$block_rules .= static::get_styles_for_block( $metadata );		} 		return $block_rules;	}

Changelog

Introduced in 6.1.0. 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.

6.1.0
Moved most internal logic to get_styles_for_block().from the docblock
5.9.0
Renamed from get_block_styles() to get_block_classes() and no longer returns preset classes.
Removed the $setting_nodes parameter.from the docblock
5.8.0
As get_block_styles().from the docblock

About this page

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Generated from the wordpress-develop 6.8.8 tag, from src/wp-includes/class-wp-theme-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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