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WP_Style_Engine::get_slug_from_preset_value( string $style_value, string $property_key ): string

Since
6.1.0
Source
wp-includes/style-engine/class-wp-style-engine.php:385
Util: Extracts the slug in kebab case from a preset string, e.g. heavenly-blue from var:preset|color|heavenlyBlue.

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_valuestring
A single CSS preset value.
$property_keystring
The CSS property that is the second element of the preset string.
Used for matching.

Return value

string
The slug, or empty string if not found.

Performance profile

How much work a call to WP_Style_Engine::get_slug_from_preset_value() 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
5–21

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 22.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

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

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

WhenInstructionsCalls it makes
always5–12none
is_string($style_value) && is_string($property_key) && $style_value21strrpos(), _wp_to_kebab_case()

Across PHP versions

PHPCompiledExecutedBranchesNotes
8.6-dev225–213
8.5225–213
8.4225–2136 fewer instructions than PHP 8.3
8.3285–273
8.2285–273
8.1285–273
7.4285–273

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 · 2

  • str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
  • _wp_to_kebab_case()This function is trying to replicate what lodash's kebabCase (JS library) does in the client.

Source code

View on Trac View on GitHub 

	protected static function get_slug_from_preset_value( $style_value, $property_key ) {		if ( is_string( $style_value ) && is_string( $property_key )			&& str_contains( $style_value, "var:preset|{$property_key}|" )		) {			$index_to_splice = strrpos( $style_value, '|' ) + 1;			return _wp_to_kebab_case( substr( $style_value, $index_to_splice ) );		}		return '';	}

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.

About this page

Parsed data
Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/style-engine/class-wp-style-engine.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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