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WordPress

WP_Font_Collection::load_from_file( string $file ): array|WP_Error

Since
6.5.0
Source
wp-includes/fonts/class-wp-font-collection.php:158
Loads the font collection data from a JSON file path.

Compatibility

WordPress
since 6.5.0
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

$filestring
File path to a JSON file containing the font collection data.

Return value

array|WP_Error
An array containing the font collection data on success, else an instance of WP_Error on failure.

Performance profile

How much work a call to WP_Font_Collection::load_from_file() 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

Touches nothing outside its own arguments.

Scaling
Constant

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

Instructions
13–16

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 21.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
1

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

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

WhenInstructionsCalls it makes
!empty($data)13wp_json_file_decode(), ->sanitize_and_validate_data()
empty($data)16wp_json_file_decode(), __()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 21 instructions, 13–16 executed per call, 1 branch. 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 · 4

Used by · 1

Source code

View on Trac View on GitHub 

	private function load_from_file( $file ) {		$data = wp_json_file_decode( $file, array( 'associative' => true ) );		if ( empty( $data ) ) {			return new WP_Error( 'font_collection_decode_error', __( 'Error decoding the font collection JSON file contents.' ) );		} 		return $this->sanitize_and_validate_data( $data, array( 'font_families' ) );	}

Changelog

Introduced in 6.5.0. 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 7.1.0 tag, from src/wp-includes/fonts/class-wp-font-collection.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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