WP_Error::add()
Method: Adds an error or appends an additional message to an existing error.
Source: wp-includes/class-wp-error.php:194
WP_Error::add_data()
Method: Adds data to an error with the given code.
Source: wp-includes/class-wp-error.php:223
WP_Error::remove()
Method: Removes the specified error.
Source: wp-includes/class-wp-error.php:271
WP_Error
Class: ClassicPress Error class.
Source: wp-includes/class-wp-error.php:21
WP_Error::__construct()
Method: Initializes the error.
Source: wp-includes/class-wp-error.php:63
WP_Error::get_error_codes()
Method: Retrieves all error codes.
Source: wp-includes/class-wp-error.php:78