get_block_asset_url( string $path ): string|false

Compatibility

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

Parameters

$pathstring

A normalized path to a block asset.

Return value

string|false

The URL to the block asset or false on failure.

Performance profile

How much work a call to get_block_asset_url() 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

4–73

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 94.

Plugin surface

None

Nothing here hands control to plugin code.

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()one call below get_block_asset_url()
• optionoption read or writeget_option()one call below get_block_asset_url()

Further down the call graph this can also reach 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 · 27 distinct outcomes

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

Uses · 11

• wp_normalize_path()Normalizes a filesystem path.
• str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
• includes_url()Retrieves the URL to the includes directory.
• get_template()Retrieves name of the active theme.
• get_template_directory()Retrieves template directory path for the active theme.
• trailingslashit()Appends a trailing slash.
• get_theme_file_uri()Retrieves the URL of a file in the theme.
• is_child_theme()Whether a child theme is in use.
• get_stylesheet()Retrieves name of the current stylesheet.
• get_stylesheet_directory()Retrieves stylesheet directory path for the active theme.
• plugins_url()Retrieves a URL within the plugins or mu-plugins directory.

Used by · 3

• register_block_script_handle()Finds a script handle for the selected block metadata field.
• register_block_script_module_id()Finds a script module ID for the selected block metadata field.
• register_block_style_handle()Finds a style handle for the block metadata field.

Source code

View on Trac ↗View on GitHub ↗

97function get_block_asset_url( $path ) {98	if ( empty( $path ) ) {99		return false;100	}101 102	// Path needs to be normalized to work in Windows env.103	static $wpinc_path_norm = '';104	if ( ! $wpinc_path_norm ) {105		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );106	}107 108	if ( str_starts_with( $path, $wpinc_path_norm ) ) {109		return includes_url( str_replace( $wpinc_path_norm, '', $path ) );110	}111 112	/** @var array<string, string> $template_paths_norm */113	static $template_paths_norm = array();114 115	$template = get_template();116	if ( ! isset( $template_paths_norm[ $template ] ) ) {117		$template_paths_norm[ $template ] = wp_normalize_path( realpath( get_template_directory() ) );118	}119 120	if ( str_starts_with( $path, trailingslashit( $template_paths_norm[ $template ] ) ) ) {121		return get_theme_file_uri( str_replace( $template_paths_norm[ $template ], '', $path ) );122	}123 124	if ( is_child_theme() ) {125		$stylesheet = get_stylesheet();126		if ( ! isset( $template_paths_norm[ $stylesheet ] ) ) {127			$template_paths_norm[ $stylesheet ] = wp_normalize_path( realpath( get_stylesheet_directory() ) );128		}129 130		if ( str_starts_with( $path, trailingslashit( $template_paths_norm[ $stylesheet ] ) ) ) {131			return get_theme_file_uri( str_replace( $template_paths_norm[ $stylesheet ], '', $path ) );132		}133	}134 135	return plugins_url( basename( $path ), $path );136}

Changelog

Introduced in 6.4.0. 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 7.1.0 tag, from src/wp-includes/blocks.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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