wp_get_mu_plugins(): string[]
- Since
- 3.0.0
- Source
wp-includes/load.php:945
Description
The default directory is wp-content/mu-plugins. To change the default directory manually, define WPMU_PLUGIN_DIR and WPMU_PLUGIN_URL in wp-config.php.
Compatibility
- WordPress
- since 3.0.0
- 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.
Return value
string[]- Array of absolute paths of files to include.
Performance profile
How much work a call to wp_get_mu_plugins() 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
- Heavy
- Scaling
- Scales with input
- Instructions
- 7–25
- Plugin surface
- None
- Called by
- 0
Reads or writes the filesystem via is_dir().
The body loops, so the work grows with how much data it finds.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 37.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- filesystemfilesystem access
is_dir()called directly
What one call costs · 3 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_get_mu_plugins() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!is_dir() | 7 | is_dir() |
is_dir() | 13 | is_dir(), opendir() |
is_dir() && $plugin === false | 25 | is_dir(), opendir(), readdir(), closedir(), sort() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 37 instructions, 7–25 executed per call, 4 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
- str_ends_with()Polyfill for `str_ends_with()` function added in PHP 8.0.
Source code
function wp_get_mu_plugins() { $mu_plugins = array(); if ( ! is_dir( WPMU_PLUGIN_DIR ) ) { return $mu_plugins; } $dh = opendir( WPMU_PLUGIN_DIR ); if ( ! $dh ) { return $mu_plugins; } while ( ( $plugin = readdir( $dh ) ) !== false ) { if ( str_ends_with( $plugin, '.php' ) ) { $mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin; } } closedir( $dh ); sort( $mu_plugins ); return $mu_plugins;}Changelog
Introduced in 3.0.0. 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 6.7.7 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.