PHP运行机制分析(多图)

珀耳塞福建

　　Introduction

Apache
Mime type handler 
 AddType application/x-httpd-php .php
 AddType application/x-httpd-php-source .phps
Server context
 Override php.ini (php_value, php_flag, etc)
 Environment variables(PHP_SELF, etc) 
 Create Child Process/Thread
CLI (command line interface)
CLI  ≈ CGI SAPI
differences
 start up in quiet mode by default 
 plain text error message(no http header)
 implicit_flush always on
 max_execution_time is set to unlimited
 others
Embed
Embed  = Mini CLI

php5embed .lib
example.c 
C++代码

• #include <php_embed.h>   
  
• int main (int argc, char *argv[]){   
  
• PHP_EMBED_START_BLOCK(argc, argv)   
  
• zend_eval_string(“echo „Hello World‟;”, NULL, “Embedded Code” TSRMLS_CC);   
  
• PHP_EMBED_END_BLOCK()   
  
• return 0;   
  
• }   
  

Lexer(flex)


Parser(bison)

Compiler

Opcode
C++代码

• struct zend_op {   
  
• opcode_handler_t handler;   
  
• znode result;   
  
• znode op1;   
  
• znode op2;   
  
• ulong extended_value;   
  
• uint lineno;   
  
• zend_uchar opcode;   
  
• };  
  

Executor

Cacher

Encoder / Decoder

Debugger

本文来源: Ben ben.yan@msn.com