WordPress Version: 5.7
/**
* Retrieves the current user object.
*
* Will set the current user, if the current user is not set. The current user
* will be set to the logged-in person. If no user is logged-in, then it will
* set the current user to 0, which is invalid and won't have any permissions.
*
* This function is used by the pluggable functions wp_get_current_user() and
* get_currentuserinfo(), the latter of which is deprecated but used for backward
* compatibility.
*
* @since 4.5.0
* @access private
*
* @see wp_get_current_user()
* @global WP_User $current_user Checks if the current user is set.
*
* @return WP_User Current WP_User instance.
*/
function _wp_get_current_user()
{
global $current_user;
if (!empty($current_user)) {
if ($current_user instanceof WP_User) {
return $current_user;
}
// Upgrade stdClass to WP_User.
if (is_object($current_user) && isset($current_user->ID)) {
$cur_id = $current_user->ID;
$current_user = null;
wp_set_current_user($cur_id);
return $current_user;
}
// $current_user has a junk value. Force to WP_User with ID 0.
$current_user = null;
wp_set_current_user(0);
return $current_user;
}
if (defined('XMLRPC_REQUEST') && XMLRPC_REQUEST) {
wp_set_current_user(0);
return $current_user;
}
/**
* Filters the current user.
*
* The default filters use this to determine the current user from the
* request's cookies, if available.
*
* Returning a value of false will effectively short-circuit setting
* the current user.
*
* @since 3.9.0
*
* @param int|false $user_id User ID if one has been determined, false otherwise.
*/
$user_id = apply_filters('determine_current_user', false);
if (!$user_id) {
wp_set_current_user(0);
return $current_user;
}
wp_set_current_user($user_id);
return $current_user;
}