(PHP4)
--------------------------------------------------------------
DB <-----> | MySQL | Oracle | ODBC | XML | IMAP | LDAP | Java | COM | ... |
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/ \
| |
| |
\ / Zend Engine
|------------| |------------------------| |-----------------|
| | | | | |
Browser ---> Web Server ---> 功能模块 -----> Web Server Disk
<-- <--- 执行器 <--- 运行时编译 <-----
| | | | | |
|------------| |------------------------| |-----------------|
PHP Script -> ZE Compiler -> Opcodes -> ZE Executor -> Output