protected function write_log() { if (!$this->options['debug_log_is_enabled']) { return; } $output_keys = array('from_email', 'from_name', 'to_email', 'to_name', 'subject', 'body'); $outputs = array('', '', '-------------', 'date' => \Date::time()->format('mysql')); foreach ($output_keys as $key) { $outputs[$key] = $this->options[$key]; } return file_put_contents($this->options['debug_log_file_path'], Util_Array::conv_arrays2key_value_str($outputs), FILE_APPEND); }