wp_using_ext_object_cache( bool $using = null ): bool
- Since
- 3.7.0
- Source
wp-includes/load.php:810
$_wp_using_ext_object_cache on and off without directly touching global.Compatibility
- WordPress
- since 3.7.0
- 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
$usingbooloptional- Whether external object cache is being used.Default:
null
Return value
bool- The current 'using' setting.
Performance profile
How much work a call to wp_using_ext_object_cache() 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
- 6–7
- Plugin surface
- None
- Called by
- 14
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 7.
Nothing here hands control to plugin code.
14 places 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_using_ext_object_cache() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6–7 | none |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 7 instructions, 6–7 executed per call, 1 branch. 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.
Used by · 14
- WP_Network::get_by_path()Retrieves the closest matching network for a domain and path.
- WP_Query::get_posts()Retrieves an array of posts based on query variables.
- WP_Site_Health::get_test_persistent_object_cache()Tests if the site uses persistent object cache and recommends to use it if not.
- _get_cron_lock()Retrieves the cron lock.
- clean_dirsize_cache()Cleans directory size cache used by recurse_dirsize().
- delete_expired_transients()Deletes all expired transients.
- delete_site_transient()Deletes a site transient.
- delete_transient()Deletes a transient.
- get_site_transient()Retrieves the value of a site transient.
- get_transient()Retrieves the value of a transient.
- recurse_dirsize()Gets the size of a directory recursively.
- set_site_transient()Sets/updates the value of a site transient.
Show all 14
- set_transient()Sets/updates the value of a transient.
- wp_start_object_cache()Starts the WordPress object cache.
Source code
function wp_using_ext_object_cache( $using = null ) { global $_wp_using_ext_object_cache; $current_using = $_wp_using_ext_object_cache; if ( null !== $using ) { $_wp_using_ext_object_cache = $using; } return $current_using;}Changelog
Introduced in 3.7.0. 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/load.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.