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WordPress

WP_Theme_JSON::get_block_selectors( object $block_type, string $root_selector ): array

Since
6.3.0
Source
wp-includes/class-wp-theme-json.php:5621
Returns the selectors metadata for a block.

Compatibility

WordPress
since 6.3.0
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

$block_typeobject
The block type.
$root_selectorstring
The block's root selector.

Return value

array
The custom selectors set by the block.

Performance profile

How much work a call to WP_Theme_JSON::get_block_selectors() 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
Light

Touches nothing outside its own arguments.

Scaling
Scales with input

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

Instructions
6–10

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 24.

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 · 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_selectors() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always6–10none

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 24 instructions, 6–10 executed per call, 4 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

Source code

View on Trac View on GitHub 

	protected static function get_block_selectors( $block_type, $root_selector ) {		if ( ! empty( $block_type->selectors ) ) {			return $block_type->selectors;		} 		$selectors = array( 'root' => $root_selector );		foreach ( static::BLOCK_SUPPORT_FEATURE_LEVEL_SELECTORS as $key => $feature ) {			$feature_selector = wp_get_block_css_selector( $block_type, $key );			if ( null !== $feature_selector ) {				$selectors[ $feature ] = array( 'root' => $feature_selector );			}		} 		return $selectors;	}

Changelog

Introduced in 6.3.0. 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/class-wp-theme-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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