get_blog_count( int|null $network_id = null ): int
- Since
- MU (3.0.0), 3.7.0, 4.8.0
- Source
wp-includes/ms-functions.php:115
Description
The count is cached and updated twice daily. This is not a live count.
Compatibility
- WordPress
- since 4.8.0
- 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
$network_idint|nulloptional- ID of the network. Default is the current network.Default:
null
Return value
int- Number of active sites on the network.
Performance profile
How much work a call to get_blog_count() 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
- Moderate
- Scaling
- Constant
- Instructions
- 6
- Plugin surface
- None
- Called by
- 5
Reads stored settings via get_network_option(), cached per request but not free on a cold cache.
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 6.
Nothing here hands control to plugin code.
5 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- optionnetwork option
get_network_option()called directly - hookthird-party callbacks
apply_filters()one call below get_blog_count() - cacheobject cache
wp_cache_get()one call below get_blog_count() - serializeserialisation
maybe_unserialize()one call below get_blog_count()
Further down the call graph this can also reach query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
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 get_blog_count() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6 | get_network_option() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 6 instructions, 6 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
- get_network_option()Retrieves a network's option value based on the option name.
Used by · 5
- WP_Debug_Data::get_wp_core()Gets the WordPress core section of the debug data.
- get_sitestats()Gets the network's site and user counts.
- wp_is_large_network()Determines whether or not we have a large network.
- wp_network_dashboard_right_now()
- wp_version_check()Checks WordPress version against the newest version.
Source code
function get_blog_count( $network_id = null ) { return get_network_option( $network_id, 'blog_count' );}Changelog
Introduced in 4.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$network_id parameter is now being used.from the docblock$network_id parameter has been deprecated.from the docblockAbout this page
- Parsed data
- Generated from the wordpress-develop 6.7.7 tag, from
src/wp-includes/ms-functions.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.