The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
| Constant | Value | Description | 
|---|---|---|
| FUNCTION_TRACE(integer) | 1 | |
| ARGS_TRACE(integer) | 2 | |
| ASSIGNMENT_TRACE(integer) | 4 | |
| STATEMENT_TRACE(integer) | 8 | |
| MEMORY_TRACE(integer) | 16 | |
| TIMING_TRACE(integer) | 32 | |
| SUMMARY_TRACE(integer) | 64 | |
| ERROR_TRACE(integer) | 128 | |
| PROF_TRACE(integer) | 256 | |
| APD_VERSION(string) | example: 1.0.2-dev |