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