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function is not described

get_theme_feature_list() WP 3.1.0

Retrieve list of WordPress theme features (aka theme tags).

No Hooks.

Return

Array. Array of features keyed by category with translations keyed by slug.

Usage

get_theme_feature_list( $api );
$api(true|false)
Whether try to fetch tags from the WordPress.org API.
Default: true

Changelog

Since 3.1.0 Introduced.
Since 3.2.0 Added 'Gray' color and 'Featured Image Header', 'Featured Images', 'Full Width Template', and 'Post Formats' features.
Since 3.5.0 Added 'Flexible Header' feature.
Since 3.8.0 Renamed 'Width' filter to 'Layout'.
Since 3.8.0 Renamed 'Fixed Width' and 'Flexible Width' options to 'Fixed Layout' and 'Fluid Layout'.
Since 3.8.0 Added 'Accessibility Ready' feature and 'Responsive Layout' option.
Since 3.9.0 Combined 'Layout' and 'Columns' filters.
Since 4.6.0 Removed 'Colors' filter.
Since 4.6.0 Added 'Grid Layout' option. Removed 'Fixed Layout', 'Fluid Layout', and 'Responsive Layout' options.
Since 4.6.0 Added 'Custom Logo' and 'Footer Widgets' features. Removed 'Blavatar' feature.
Since 4.6.0 Added 'Blog', 'E-Commerce', 'Education', 'Entertainment', 'Food & Drink', 'Holiday', 'News', 'Photography', and 'Portfolio' subjects. Removed 'Photoblogging' and 'Seasonal' subjects.
Since 4.9.0 Reordered the filters from 'Layout', 'Features', 'Subject' to 'Subject', 'Features', 'Layout'.
Since 4.9.0 Removed 'BuddyPress', 'Custom Menu', 'Flexible Header', 'Front Page Posting', 'Microformats', 'RTL Language Support', 'Threaded Comments', and 'Translation Ready' features.
Since 5.5.0 Added 'Block Editor Patterns', 'Block Editor Styles', and 'Full Site Editing' features.
Since 5.5.0 Added 'Wide Blocks' layout option.
Since 5.8.1 Added 'Template Editing' feature.

Code of get_theme_feature_list() WP 5.8.2

function get_theme_feature_list( $api = true ) {
	// Hard-coded list is used if API is not accessible.
	$features = array(

		__( 'Subject' )  => array(
			'blog'           => __( 'Blog' ),
			'e-commerce'     => __( 'E-Commerce' ),
			'education'      => __( 'Education' ),
			'entertainment'  => __( 'Entertainment' ),
			'food-and-drink' => __( 'Food & Drink' ),
			'holiday'        => __( 'Holiday' ),
			'news'           => __( 'News' ),
			'photography'    => __( 'Photography' ),
			'portfolio'      => __( 'Portfolio' ),
		),

		__( 'Features' ) => array(
			'accessibility-ready'   => __( 'Accessibility Ready' ),
			'block-patterns'        => __( 'Block Editor Patterns' ),
			'block-styles'          => __( 'Block Editor Styles' ),
			'custom-background'     => __( 'Custom Background' ),
			'custom-colors'         => __( 'Custom Colors' ),
			'custom-header'         => __( 'Custom Header' ),
			'custom-logo'           => __( 'Custom Logo' ),
			'editor-style'          => __( 'Editor Style' ),
			'featured-image-header' => __( 'Featured Image Header' ),
			'featured-images'       => __( 'Featured Images' ),
			'footer-widgets'        => __( 'Footer Widgets' ),
			'full-site-editing'     => __( 'Full Site Editing' ),
			'full-width-template'   => __( 'Full Width Template' ),
			'post-formats'          => __( 'Post Formats' ),
			'sticky-post'           => __( 'Sticky Post' ),
			'template-editing'      => __( 'Template Editing' ),
			'theme-options'         => __( 'Theme Options' ),
		),

		__( 'Layout' )   => array(
			'grid-layout'   => __( 'Grid Layout' ),
			'one-column'    => __( 'One Column' ),
			'two-columns'   => __( 'Two Columns' ),
			'three-columns' => __( 'Three Columns' ),
			'four-columns'  => __( 'Four Columns' ),
			'left-sidebar'  => __( 'Left Sidebar' ),
			'right-sidebar' => __( 'Right Sidebar' ),
			'wide-blocks'   => __( 'Wide Blocks' ),
		),

	);

	if ( ! $api || ! current_user_can( 'install_themes' ) ) {
		return $features;
	}

	$feature_list = get_site_transient( 'wporg_theme_feature_list' );
	if ( ! $feature_list ) {
		set_site_transient( 'wporg_theme_feature_list', array(), 3 * HOUR_IN_SECONDS );
	}

	if ( ! $feature_list ) {
		$feature_list = themes_api( 'feature_list', array() );
		if ( is_wp_error( $feature_list ) ) {
			return $features;
		}
	}

	if ( ! $feature_list ) {
		return $features;
	}

	set_site_transient( 'wporg_theme_feature_list', $feature_list, 3 * HOUR_IN_SECONDS );

	$category_translations = array(
		'Layout'   => __( 'Layout' ),
		'Features' => __( 'Features' ),
		'Subject'  => __( 'Subject' ),
	);

	$wporg_features = array();

	// Loop over the wp.org canonical list and apply translations.
	foreach ( (array) $feature_list as $feature_category => $feature_items ) {
		if ( isset( $category_translations[ $feature_category ] ) ) {
			$feature_category = $category_translations[ $feature_category ];
		}

		$wporg_features[ $feature_category ] = array();

		foreach ( $feature_items as $feature ) {
			if ( isset( $features[ $feature_category ][ $feature ] ) ) {
				$wporg_features[ $feature_category ][ $feature ] = $features[ $feature_category ][ $feature ];
			} else {
				$wporg_features[ $feature_category ][ $feature ] = $feature;
			}
		}
	}

	return $wporg_features;
}