### Fixed
- Shutdown span flushing blocking the process when forked #493
- Memory access errors in cases when PHP code was run after extension data was freed on request shutdown #505
- Request init hook working when open_basedir restriction is in effect #505
- Ensure global resources are freed in shutdown #521 #523
- Http transport not setting required `X-Datadog-Trace-Count` header #525
### Changed
- Remove `zend_execute_ex` override and trace `ZEND_DO_UCALL` #519