_wp_add_global_attributes() │ WP 3.5.0

Helper function to add global attributes to a tag in the allowed HTML list.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

Array. The array of attributes with global attributes added.

Usage

_wp_add_global_attributes( $value );
$value(array) (required)
An array of attributes.

Changelog

Since 3.5.0 Introduced.
Since 5.0.0 Added support for data-* wildcard attributes.
Since 6.0.0 Added dir, lang, and xml:lang to global attributes.
Since 6.3.0 Added aria-controls, aria-current, and aria-expanded attributes.
Since 6.4.0 Added aria-live and hidden attributes.

_wp_add_global_attributes() code WP 7.0

wp-includes/kses.php 
function _wp_add_global_attributes( $value ) {
	$global_attributes = array(
		'aria-controls'    => true,
		'aria-current'     => true,
		'aria-describedby' => true,
		'aria-details'     => true,
		'aria-expanded'    => true,
		'aria-hidden'      => true,
		'aria-label'       => true,
		'aria-labelledby'  => true,
		'aria-live'        => true,
		'class'            => true,
		'data-*'           => true,
		'dir'              => true,
		'hidden'           => true,
		'id'               => true,
		'lang'             => true,
		'style'            => true,
		'title'            => true,
		'role'             => true,
		'xml:lang'         => true,
	);

	if ( true === $value ) {
		$value = array();
	}

	if ( is_array( $value ) ) {
		return array_merge( $value, $global_attributes );
	}

	return $value;
}