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. Use wp_get_current_user() instead.

_wp_get_current_user()

Retrieves the current user object.

Description

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.

See also

Return

(WP_User) Current WP_User instance.

Source

File: wp-includes/user.php 

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 WP-3.9.0
	 *
	 * @param int|bool $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;
}

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Changelog

Changelog
Version Description
4.5.0 Introduced.