create_initial_theme_features()
- Since
- 5.5.0, 6.0.1
- Source
wp-includes/theme.php:3935
Description
See 'setup_theme'.
Compatibility
- WordPress
- since 6.0.1
- 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.
Performance profile
How much work a call to create_initial_theme_features() 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
- Scaling
- Constant
- Instructions
- 11–16
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 254.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
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 create_initial_theme_features() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!is_array($formats) | 11 | array_merge() |
is_array($formats) | 16 | array_values(), array_merge() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 253 | 11–15 | 1 | 1 fewer instruction than PHP 8.5 |
| 8.5 | 254 | 11–16 | 1 | |
| 8.4 | 254 | 11–16 | 1 | |
| 8.3 | 254 | 11–16 | 1 | |
| 8.2 | 254 | 11–16 | 1 | |
| 8.1 | 254 | 11–16 | 1 | |
| 7.4 | 254 | 11–16 | 1 |
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 · 3
- register_theme_feature()Registers a theme feature for use in add_theme_support().
- __()Retrieves the translation of $text.
- get_post_format_slugs()Retrieves the array of post format slugs.
Source code
function create_initial_theme_features() { register_theme_feature( 'align-wide', array( 'description' => __( 'Whether theme opts in to wide alignment CSS class.' ), 'show_in_rest' => true, ) ); register_theme_feature( 'automatic-feed-links', array( 'description' => __( 'Whether posts and comments RSS feed links are added to head.' ), 'show_in_rest' => true, ) ); register_theme_feature( 'block-templates', array( 'description' => __( 'Whether a theme uses block-based templates.' ), 'show_in_rest' => true, ) ); register_theme_feature( 'block-template-parts', array( 'description' => __( 'Whether a theme uses block-based template parts.' ), 'show_in_rest' => true, ) ); register_theme_feature( 'custom-background', array( 'description' => __( 'Custom background if defined by the theme.' ), 'type' => 'object', 'show_in_rest' => array( 'schema' => array( 'properties' => array( 'default-image' => array( 'type' => 'string', 'format' => 'uri', ), 'default-preset' => array( 'type' => 'string', 'enum' => array( 'default', 'fill', 'fit', 'repeat', 'custom', ), ), 'default-position-x' => array( 'type' => 'string', 'enum' => array( 'left', 'center', 'right', ), ), 'default-position-y' => array( 'type' => 'string', 'enum' => array( 'left', 'center', 'right', ), ), 'default-size' => array( 'type' => 'string', 'enum' => array( 'auto', 'contain', 'cover', ), ), 'default-repeat' => array( 'type' => 'string', 'enum' => array( 'repeat-x', 'repeat-y',Changelog
Introduced in 5.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
block-templates feature was added.from the docblockAbout this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 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
- Something wrong on this page? Report it and it gets fixed in the next regeneration.