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WordPress

WP_Filesystem_Base::wp_themes_dir( string|false $theme = false ): string|false

Since
2.7.0
Source
wp-admin/includes/class-wp-filesystem-base.php:120
Returns the path on the remote filesystem of the Themes Directory.

Compatibility

WordPress
since 2.7.0
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

$themestring|falseoptional
The theme stylesheet or template for the directory.
Default false.Default: false

Return value

string|false
The location of the remote path, or false on failure.

Performance profile

How much work a call to WP_Filesystem_Base::wp_themes_dir() 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

Reads or writes the filesystem via is_dir().

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
17–22

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 23.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

  • filesystemfilesystem accessis_dir()called directly
  • hookthird-party callbacksapply_filters()one call below WP_Filesystem_Base::wp_themes_dir()

Further down the call graph this can also reach option, cache, serialize, transient and query. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

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 WP_Filesystem_Base::wp_themes_dir() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
$theme_root === "/themes"17–18get_theme_root(), ->find_folder()
$theme_root !== "/themes"18–22get_theme_root(), is_dir(), ->find_folder()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 23 instructions, 17–22 executed per call, 3 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 · 2

Source code

View on Trac View on GitHub 

	public function wp_themes_dir( $theme = false ) {		$theme_root = get_theme_root( is_string( $theme ) ? $theme : '' ); 		// Account for relative theme roots.		if ( '/themes' === $theme_root || ! is_dir( $theme_root ) ) {			$theme_root = WP_CONTENT_DIR . $theme_root;		} 		return $this->find_folder( $theme_root );	}

Changelog

Introduced in 2.7.0. One change between 6.7.7 and 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

7.1.0
Return type changed from string to string|false.verified against source
2.7.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 7.1.0 tag, from src/wp-admin/includes/class-wp-filesystem-base.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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