WordPress at a glance
function is not described

get_theme_support() WP 3.1.0

Gets the theme support arguments passed when registering that support.

Example usage:

get_theme_support( 'custom-logo' );
get_theme_support( 'custom-header', 'width' );

No Hooks.

Return

Mixed. The array of extra arguments or the value for the registered feature.

Usage

get_theme_support( $feature, ...$args );
$feature(string) (required)
The feature to check. See add_theme_support()() for the list of possible values.
...$args(mixed) (required)
Optional extra arguments to be checked against certain features.

Notes

  • Global. Array. $_wp_theme_features

Changelog

Since 3.1.0 Introduced.
Since 5.3.0 Formalized the existing and already documented ...$args parameter by adding it to the function signature.

Code of get_theme_support() WP 5.7.2

<?php
function get_theme_support( $feature, ...$args ) {
	global $_wp_theme_features;
	if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
		return false;
	}

	if ( ! $args ) {
		return $_wp_theme_features[ $feature ];
	}

	switch ( $feature ) {
		case 'custom-logo':
		case 'custom-header':
		case 'custom-background':
			if ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) ) {
				return $_wp_theme_features[ $feature ][0][ $args[0] ];
			}
			return false;

		default:
			return $_wp_theme_features[ $feature ];
	}
}