get_theme_root_uri( string $stylesheet_or_template = '', string $theme_root = '' ): string

Description

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$stylesheet_or_templatestringoptional

The stylesheet or template name of the theme.
Default is to leverage the main theme root.Default: ''

$theme_rootstringoptional

The theme root for which calculations will be based, preventing the need for a get_raw_theme_root() call. Default empty.Default: ''

Return value

string

Themes directory URI.

Performance profile

How much work a call to get_theme_root_uri() 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

Reads stored settings via get_option(), cached per request but not free on a cold cache.

Scaling

Constant

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

Instructions

18–46

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 73.

Plugin surface

1 hook

Third-party callbacks on 'theme_root_uri' run inside this call, and their cost is not bounded by anything here.

Called by

3

3 places in core call this, so the cost is paid more often than your own code shows.

What it touches

• hookthird-party callbacksapply_filters()called directly
• optionoption read or writeget_option()called directly
• cacheobject cachewp_cache_get()one call below get_theme_root_uri()
• serializeserialisationmaybe_unserialize()one call below get_theme_root_uri()

Further down the call graph this can also reach 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 · 8 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost get_theme_root_uri() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 1

One hook fires while get_theme_root_uri() runs, in this order:

1. 1
   apply_filters( theme_root_uri )filterline 682 (+35 into the body)

   Filters the URI for themes directory.

Uses · 7

• get_raw_theme_root()Gets the raw theme root relative to the content directory with no filters applied.
• str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
• content_url()Retrieves the URL to the content directory.
• site_url()Retrieves the URL for the current site where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.
• plugins_url()Retrieves a URL within the plugins or mu-plugins directory.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• get_option()Retrieves an option value based on an option name.

Used by · 3

• WP_Theme::get_theme_root_uri()Returns the URL to the directory of the theme root.
• get_stylesheet_directory_uri()Retrieves stylesheet directory URI for the active theme.
• get_template_directory_uri()Retrieves template directory URI for the active theme.

Source code

View on Trac ↗View on GitHub ↗

647function get_theme_root_uri( $stylesheet_or_template = '', $theme_root = '' ) {648	global $wp_theme_directories;649 650	if ( $stylesheet_or_template && ! $theme_root ) {651		$theme_root = get_raw_theme_root( $stylesheet_or_template );652	}653 654	if ( $stylesheet_or_template && $theme_root ) {655		if ( in_array( $theme_root, (array) $wp_theme_directories, true ) ) {656			// Absolute path. Make an educated guess. YMMV -- but note the filter below.657			if ( str_starts_with( $theme_root, WP_CONTENT_DIR ) ) {658				$theme_root_uri = content_url( str_replace( WP_CONTENT_DIR, '', $theme_root ) );659			} elseif ( str_starts_with( $theme_root, ABSPATH ) ) {660				$theme_root_uri = site_url( str_replace( ABSPATH, '', $theme_root ) );661			} elseif ( str_starts_with( $theme_root, WP_PLUGIN_DIR ) || str_starts_with( $theme_root, WPMU_PLUGIN_DIR ) ) {662				$theme_root_uri = plugins_url( basename( $theme_root ), $theme_root );663			} else {664				$theme_root_uri = $theme_root;665			}666		} else {667			$theme_root_uri = content_url( $theme_root );668		}669	} else {670		$theme_root_uri = content_url( 'themes' );671	}672 673	/**674	 * Filters the URI for themes directory.675	 *676	 * @since 1.5.0677	 *678	 * @param string $theme_root_uri         The URI for themes directory.679	 * @param string $siteurl                WordPress web address which is set in General Options.680	 * @param string $stylesheet_or_template The stylesheet or template name of the theme.681	 */682	return apply_filters( 'theme_root_uri', $theme_root_uri, get_option( 'siteurl' ), $stylesheet_or_template );683}

Changelog

Introduced in 1.5.0. Unchanged from 6.7.7 through 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.

About this page

Parsed data

Generated from the wordpress-develop 6.8.8 tag, from src/wp-includes/theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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