1. Call all possible shutdown functions registered with register_shutdown_function()

2. Call all possible __destruct() functions

3. Flush all output buffers

4. Send the set HTTP headers (note: This must be done AFTER php_output_discard_all() / php_output_end_all() !!)

5. Reset max_execution_time (no longer executing php code after response sent)

6. Call all extensions RSHUTDOWN functions

7. Destroy super-globals

7.5 free last error information

7. Shutdown scanner/executor/compiler and restore ini entries

8. Call all extensions post-RSHUTDOWN functions

9. SAPI related shutdown (free stuff)

10. Destroy stream hashes

11. Free Willy (here be crashes) -shuts down memory manager

12. Reset max_execution_time