WP_Theme_JSON::get_feature_selector( array $feature_selectors, string $feature_key, string $default_selector ): string
- Since
- 7.1.0
- Source
wp-includes/class-wp-theme-json.php:2554
Description
If the block defines a feature-level selector (as a string or an object with a root key), that selector is returned. Otherwise, the block's default selector is used.
Compatibility
- WordPress
- since 7.1.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in 1 of the 5 tracked releases, added in 7.1.0, and compiles on PHP 7.4 through 8.6-dev.
Parameters
$feature_selectorsarray$feature_keystring- The feature to look up (e.g. 'dimensions').
$default_selectorstring- Fallback selector.
Return value
string- The resolved selector.
Performance profile
How much work a call to WP_Theme_JSON::get_feature_selector() 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
- Scaling
- Constant
- Instructions
- 6–16
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 19.
Nothing here hands control to plugin code.
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_feature_selector() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6–16 | none |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 19 | 6–16 | 4 | |
| 8.5 | 19 | 6–16 | 4 | |
| 8.4 | 19 | 6–16 | 4 | |
| 8.3 | 19 | 6–16 | 4 | |
| 8.2 | 19 | 6–16 | 4 | 1 fewer instruction than PHP 8.1 |
| 8.1 | 20 | 7–16 | 4 | |
| 7.4 | 20 | 7–16 | 4 |
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.
Source code
private static function get_feature_selector( array $feature_selectors, string $feature_key, string $default_selector ): string { if ( ! isset( $feature_selectors[ $feature_key ] ) ) { return $default_selector; } $feature = $feature_selectors[ $feature_key ]; if ( is_string( $feature ) ) { return $feature; } if ( isset( $feature['root'] ) && is_string( $feature['root'] ) ) { return $feature['root']; } return $default_selector; }Changelog
Introduced in 7.1.0.
Signature, return type and hooks compared across 1 parsed release.
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
- Something wrong on this page? Report it and it gets fixed in the next regeneration.