get_id_from_blogname( string $slug ): int|null
- Since
- MU (3.0.0), 4.7.0
- Source
wp-includes/ms-blogs.php:91
Compatibility
- WordPress
- since 4.7.0
- 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
$slugstring- A site's slug.
Return value
int|null- The site ID, or null if no site is found for the given slug.
Performance profile
How much work a call to get_id_from_blogname() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 25–31
- Plugin surface
- None
- Called by
- 2
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 36.
Nothing here hands control to plugin code.
2 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()one call below get_id_from_blogname()
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_id_from_blogname() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
empty($site_ids) | 25–28 | get_network(), is_subdomain_install(), number() |
!empty($site_ids) | 28–31 | get_network(), is_subdomain_install(), number(), array_shift() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 36 | 25–31 | 2 | |
| 8.5 | 36 | 25–31 | 2 | |
| 8.4 | 36 | 25–31 | 2 | 6 fewer instructions than PHP 8.3 |
| 8.3 | 42 | 28–37 | 2 | |
| 8.2 | 42 | 28–37 | 2 | |
| 8.1 | 42 | 28–37 | 2 | |
| 7.4 | 42 | 28–37 | 2 |
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 · 3
- get_network()Retrieves network data given a network ID or network object.
- is_subdomain_install()Whether a subdomain configuration is enabled.
- get_sites()Retrieves a list of sites matching requested arguments.
Used by · 2
- avoid_blog_page_permalink_collision()Avoids a collision between a site slug and a permalink slug.
- get_blog_details()Retrieves the details for a blog from the blogs table and blog options.
Source code
function get_id_from_blogname( $slug ) { $current_network = get_network(); $slug = trim( $slug, '/' ); if ( is_subdomain_install() ) { $domain = $slug . '.' . preg_replace( '|^www\.|', '', $current_network->domain ); $path = $current_network->path; } else { $domain = $current_network->domain; $path = $current_network->path . $slug . '/'; } $site_ids = get_sites( array( 'number' => 1, 'fields' => 'ids', 'domain' => $domain, 'path' => $path, 'update_site_meta_cache' => false, ) ); if ( empty( $site_ids ) ) { return null; } return array_shift( $site_ids );}Changelog
Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
get_sites().from the docblockAbout this page
- Parsed data
- Generated from the wordpress-develop 6.8.8 tag, from
src/wp-includes/ms-blogs.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.