wppaste
WordPress

install_themes_feature_list(): array

Since
2.8.0
Source
wp-admin/includes/theme-install.php:62
Retrieves the list of WordPress theme features (aka theme tags).

Compatibility

Deprecated in WordPress 3.1.0. Use get_theme_feature_list() instead.

WordPress
since 2.8.0
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.

Return value

array

Performance profile

How much work a call to install_themes_feature_list() 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
Expensive

Reaches an outbound HTTP request via wp_remote_get().

Scaling
Constant

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

Instructions
11–35

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 37.

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

  • transienttransientget_transient()called directly
  • hookthird-party callbacksdo_action()one call below install_themes_feature_list()
  • cacheobject cachewp_cache_get()one call below install_themes_feature_list()
  • optionoption read or writeget_option()one call below install_themes_feature_list()
  • httpoutbound HTTP requestwp_remote_get()one call below install_themes_feature_list()

Further down the call graph this can also reach serialize 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 · 4 distinct outcomes

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

WhenInstructionsCalls it makes
always11_deprecated_function(), get_transient()
always19_deprecated_function(), get_transient(), set_transient()
is_wp_error()28_deprecated_function(), get_transient(), set_transient(), themes_api(), is_wp_error()
!is_wp_error()35_deprecated_function(), get_transient(), set_transient(), themes_api(), is_wp_error(), set_transient()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 37 instructions, 11–35 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 · 5

Source code

View on Trac View on GitHub 

function install_themes_feature_list() {	_deprecated_function( __FUNCTION__, '3.1.0', 'get_theme_feature_list()' ); 	$cache = get_transient( 'wporg_theme_feature_list' );	if ( ! $cache ) {		set_transient( 'wporg_theme_feature_list', array(), 3 * HOUR_IN_SECONDS );	} 	if ( $cache ) {		return $cache;	} 	$feature_list = themes_api( 'feature_list', array() );	if ( is_wp_error( $feature_list ) ) {		return array();	} 	set_transient( 'wporg_theme_feature_list', $feature_list, 3 * HOUR_IN_SECONDS ); 	return $feature_list;}

Changelog

Introduced in 2.8.0. 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.

3.1.0
Deprecated. Use get_theme_feature_list() instead.from the docblock
2.8.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 6.9.7 tag, from src/wp-admin/includes/theme-install.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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