PHP运行机制分析(多图)

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 [email protected]