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_custom_header_background_just_in_time()

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Registers the internal custom header and background routines.

Source

File: wp-includes/theme.php 

function _custom_header_background_just_in_time() {
	global $custom_image_header, $custom_background;

	if ( current_theme_supports( 'custom-header' ) ) {
		// In case any constants were defined after an add_custom_image_header() call, re-run.
		add_theme_support( 'custom-header', array( '__jit' => true ) );

		$args = get_theme_support( 'custom-header' );
		if ( $args[0]['wp-head-callback'] ) {
			add_action( 'wp_head', $args[0]['wp-head-callback'] );
		}

		if ( is_admin() ) {
			require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
			$custom_image_header = new Custom_Image_Header( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
		}
	}

	if ( current_theme_supports( 'custom-background' ) ) {
		// In case any constants were defined after an add_custom_background() call, re-run.
		add_theme_support( 'custom-background', array( '__jit' => true ) );

		$args = get_theme_support( 'custom-background' );
		add_action( 'wp_head', $args[0]['wp-head-callback'] );

		if ( is_admin() ) {
			require_once ABSPATH . 'wp-admin/includes/class-custom-background.php';
			$custom_background = new Custom_Background( $args[0]['admin-head-callback'], $args[0]['admin-preview-callback'] );
		}
	}
}

Uses

Uses Description
wp-admin/includes/class-custom-image-header.php: Custom_Image_Header::__construct()

Constructor – Register administration header callback.
wp-admin/includes/class-custom-background.php: Custom_Background::__construct()

Constructor – Register administration header callback.
wp-includes/theme.php: current_theme_supports()

Checks a theme’s support for a given feature.
wp-includes/theme.php: add_theme_support()

Registers theme support for a given feature.
wp-includes/theme.php: get_theme_support()

Gets the theme support arguments passed when registering that support.
wp-includes/load.php: is_admin()

Determines whether the current request is for an administrative interface page.
wp-includes/plugin.php: add_action()

Hooks a function on to a specific action.

Changelog

Version Description
3.4.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_custom_header_background_just_in_time