Get User's Capabilities

## get-user-capabilities.php

<?php

/**
 * Get user's capabilities.
 *
 * @param  int|WP_User $user The user ID or object. Default is the current user.
 *
 * @return array             The user's capabilities or empty array if none or user doesn't exist.
 */
function km_get_user_capabilities( $user = null ) {

	$user = $user ? new WP_User( $user ) : wp_get_current_user();

	return array_keys( $user->allcaps );
}