WP_Error::get_error_messages()
Method: Retrieves all error messages, or the error messages for the given error code.
Source: wp-includes/class-wp-error.php:112
WP_Error::get_error_message()
Method: Gets a single error message.
Source: wp-includes/class-wp-error.php:142
WP_Error::get_error_data()
Method: Retrieves the most recently added error data for an error code.
Source: wp-includes/class-wp-error.php:161
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