WP_Theme::cache_get( string $key ): mixed
- Since
- 3.4.0
- Source
wp-includes/class-wp-theme.php:827
Description
Cache entries are keyed by the theme and the type of data.
Compatibility
- WordPress
- since 3.4.0
- 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
$keystring- Type of data to retrieve (theme, screenshot, headers, post_templates)
Return value
mixed- Retrieved data
Performance profile
How much work a call to WP_Theme::cache_get() 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
- Scaling
- Constant
- Instructions
- 9
- Plugin surface
- None
- Called by
- 4
Only touches the object cache, via wp_cache_get().
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5. The body compiles to 9.
Nothing here hands control to plugin code.
4 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- cacheobject cache
wp_cache_get()called directly
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::cache_get() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 9 | wp_cache_get() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 9 instructions, 9 executed per call, 0 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
- wp_cache_get()Retrieves the cache contents from the cache by key and group.
Used by · 4
- WP_Theme::__construct()Constructor for WP_Theme.
- WP_Theme::get()Gets a raw, unformatted theme header.
- WP_Theme::get_post_templates()Returns the theme's post templates.
- WP_Theme::get_screenshot()Returns the main screenshot file for the theme.
Source code
private function cache_get( $key ) { return wp_cache_get( $key . '-' . $this->cache_hash, 'themes' ); }Changelog
Introduced in 3.4.0. Unchanged from 6.7.7 through 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.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.