Az itt felsorolt konstansok minden elérthetőek mivel részei a PHP alaptelepítésének.
Táblázat 1. openlog() Options
| Constant | Description | 
|---|---|
| LOG_CONS | if there is an error while sending data to the system logger, write directly to the system console | 
| LOG_NDELAY | open the connection to the logger immediately | 
| LOG_ODELAY | (default) delay opening the connection until the first message is logged | 
| LOG_PERROR | print log message also to standard error | 
| LOG_PID | include PID with each message | 
Táblázat 2. syslog() Priorities (in descending order)
| Constant | Description | 
|---|---|
| LOG_EMERG | system is unusable | 
| LOG_ALERT | action must be taken immediately | 
| LOG_CRIT | critical conditions | 
| LOG_ERR | error conditions | 
| LOG_WARNING | warning conditions | 
| LOG_NOTICE | normal, but significant, condition | 
| LOG_INFO | informational message | 
| LOG_DEBUG | debug-level message |