A quick note: here’s how to write a line of text into logging on the PHP runtime:
syslog(LOG_INFO, "Log Text: " . $variable_to_log);
The first argument can be replaced with standard PHP logging levels, such as LOG_WARNING.
A reminder: App Engine ignores calls to openlog() and closelog() . While you can still call these functions (for instance if you have legacy code), they will not affect logging.