json_last_error_msg Returns the error string of the last json_encode() or json_decode() call &reftitle.description; stringjson_last_error_msg Returns the error string of the last json_encode or json_decode call, which did not specify JSON_THROW_ON_ERROR. &reftitle.parameters; &no.function.parameters; &reftitle.returnvalues; Returns the error message on success, "No error" if no error has occurred, &return.falseforfailure;. &reftitle.seealso; json_last_error