如何开始在C ++中编写PHP5扩展 [英] How to start writing a PHP5 extension in C++
问题描述
我正在写一个PHP5扩展,虽然我可以用C语言编写,但使用C ++并利用STL和Boost更容易。
麻烦的是,我看到的教程只处理C,我正在寻找一个使用C ++的基本示例
这是我到目前为止所尝试的:
config.m4
[--enable-hello启用Hello World支持])
如果测试$ PHP_HELLO=yes ;然后
AC_DEFINE(HAVE_HELLO,1,[是否有Hello World])
PHP_NEW_EXTENSION(hello,hello.cpp,$ ext_shared)
fi
php_hello.h
注意我试图声明PHP接口为extern C
#ifndef PHP_HELLO_H
#define PHP_HELLO_H 1
extern C{
#define PHP_HELLO_WORLD_VERSION1.0
#define PHP_HELLO_WORLD_EXTNAMEhello
PHP_FUNCTION(hello_world);
extern zend_module_entry hello_module_entry;
#define phpext_hello_ptr& hello_module_entry
}
#endif
$ b bhello.cpp
#ifdef HAVE_CONFIG_H
#includeconfig.h
endif
#includephp.h
#includephp_hello.h
static function_entry hello_functions [] = {
PHP_FE(hello_world, NULL)
{NULL,NULL,NULL}
};
zend_module_entry hello_module_entry = {
#if ZEND_MODULE_API_NO> = 20010901
STANDARD_MODULE_HEADER,
#endif
PHP_HELLO_WORLD_EXTNAME,
hello_functions,
NULL,
NULL,
NULL,
NULL,
NULL,
#if ZEND_MODULE_API_NO> = 20010901
PHP_HELLO_WORLD_VERSION,
#endif
STANDARD_MODULE_PROPERTIES
};
#ifdef COMPILE_DL_HELLO
ZEND_GET_MODULE(hello)
#endif
PHP_FUNCTION(hello_world)
{
RETURN_STRING世界,1);
}
....这里是我的构建错误:
如果我phpize,配置和使这个,我得到以下(重新格式化为了清晰)
$ make
/ bin / bash /home/paul/php5/php-5.2.8/ext/hello2/libtool
--mode = compile
-I。
-I / home / paul / php5 / php-5.2.8 / ext / hello2 -DPHP_ATOM_INC
-I / home / paul / php5 / php-5.2.8 / ext / hello2 / include
-I / home / paul / php5 / php-5.2.8 / ext / hello2 / main
-I / home / paul / php5 / php-5.2.8 / ext / hello2
-I / usr / local / include / php
-I / usr / local / include / php / main
-I / usr / local / include / php / TSRM
-I / usr / local / include / php / Zend
-I / usr / local / include / php / ext
-I / usr / local / include / php / ext / date / lib
-DHAVE_CONFIG_H
-c /home/paul/php5/php-5.2.8/ext/hello2/hello.cpp
-o hello.lo
libtool:compile:unrecognized option`-I。'
libtool:compile:试试`libtool --help'获取更多信息。
make:*** [hello.lo]错误1
我怀疑我需要更多工作做到config.m4为了创建一个工作的makefile,但我是新的GCC工具链。
如果它有帮助,我只针对php 5.2.6+,只有在Linux(具体来说,Ubuntu 8.04)。我的构建环境是使用Ubuntu 8.10,使用gcc 4.3.2
指针非常感谢!
解决方案发布后,我遇到了 CodeGen_PECL ,它从基于XML的描述中创建了一个框架扩展扩展。这包括一个标签使它输出C ++
除了确保头文件使用externC,生成的cpp文件还确保ZEND_GET_MODULE(hello)一个externC块。
如预期,最大的区别是在m4文件,它看起来像这样:
dnl
dnl $ Id:$
dnl
PHP_ARG_ENABLE(hello,是否启用hello函数,
[--enable-hello启用hello支持])
如果测试$ PHP_HELLO!=no;然后
PHP_REQUIRE_CXX
AC_LANG_CPLUSPLUS
PHP_ADD_LIBRARY(stdc ++ ,, HELLO_SHARED_LIBADD)
export OLD_CPPFLAGS =$ CPPFLAGS
export CPPFLAGS =$ CPPFLAGS $ INCLUDES -DHAVE_HELLO
AC_MSG_CHECKING(PHP版本)
AC_TRY_COMPILE([#include< php_version.h>],[
#if PHP_VERSION_ID< 40000
#错误此扩展功能至少需要PHP version 4.0.0
#endif
],
[AC_MSG_RESULT(ok)],
[AC_MSG_ERROR(至少需要PHP 4.0.0])])
export CPPFLAGS =$ OLD_CPPFLAGS
PHP_SUBST(HELLO_SHARED_LIBADD)
AC_DEFINE(HAVE_HELLO,1,[])
PHP_NEW_EXTENSION (hello,hello.cpp,$ ext_shared)
fi
如果您遇到同样的问题,请使用 CodeGen_PECL ,或调整上面的m4示例(以及确保您已在标题中和ZEND_GET_MODULE宏周围使用externC)
I'm writing a PHP5 extension, and while I could write it in C, it would be easier to use C++ and take advantage of the STL and Boost.
Trouble is, the tutorials I've seen only deal with C, and I'm looking for a basic example which uses C++
Here's what I've tried so far:
config.m4
[ --enable-hello Enable Hello World support]) if test "$PHP_HELLO" = "yes"; then AC_DEFINE(HAVE_HELLO, 1, [Whether you have Hello World]) PHP_NEW_EXTENSION(hello, hello.cpp, $ext_shared) fi
php_hello.h
Note my attempt to declare the bits that PHP interfaces with as extern "C"
#ifndef PHP_HELLO_H #define PHP_HELLO_H 1 extern "C" { #define PHP_HELLO_WORLD_VERSION "1.0" #define PHP_HELLO_WORLD_EXTNAME "hello" PHP_FUNCTION(hello_world); extern zend_module_entry hello_module_entry; #define phpext_hello_ptr &hello_module_entry } #endif
hello.cpp
#ifdef HAVE_CONFIG_H #include "config.h" #endif #include "php.h" #include "php_hello.h" static function_entry hello_functions[] = { PHP_FE(hello_world, NULL) {NULL, NULL, NULL} }; zend_module_entry hello_module_entry = { #if ZEND_MODULE_API_NO >= 20010901 STANDARD_MODULE_HEADER, #endif PHP_HELLO_WORLD_EXTNAME, hello_functions, NULL, NULL, NULL, NULL, NULL, #if ZEND_MODULE_API_NO >= 20010901 PHP_HELLO_WORLD_VERSION, #endif STANDARD_MODULE_PROPERTIES }; #ifdef COMPILE_DL_HELLO ZEND_GET_MODULE(hello) #endif PHP_FUNCTION(hello_world) { RETURN_STRING("Hello World", 1); }
....and here are my build errors:
If I phpize, configure and make this, I get the following (reformatted for clarity)
$ make /bin/bash /home/paul/php5/php-5.2.8/ext/hello2/libtool --mode=compile -I. -I/home/paul/php5/php-5.2.8/ext/hello2 -DPHP_ATOM_INC -I/home/paul/php5/php-5.2.8/ext/hello2/include -I/home/paul/php5/php-5.2.8/ext/hello2/main -I/home/paul/php5/php-5.2.8/ext/hello2 -I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -I/usr/local/include/php/ext/date/lib -DHAVE_CONFIG_H -c /home/paul/php5/php-5.2.8/ext/hello2/hello.cpp -o hello.lo libtool: compile: unrecognized option `-I.' libtool: compile: Try `libtool --help' for more information. make: *** [hello.lo] Error 1
I suspect I need more work doing to the config.m4 in order to create a working makefile but I'm pretty new to the GCC toolchain.
If it helps, I'm only targetting php 5.2.6+, and only on Linux (specifically, Ubuntu 8.04). My build environment is using Ubuntu 8.10, using gcc 4.3.2
Pointers gratefully received!
解决方案After posting I came across CodeGen_PECL which creates a skeleton extension from an XML based description of the extension. This includes a tag make it output C++
As well as making sure the header file used extern "C", the generated cpp file also ensured the ZEND_GET_MODULE(hello) was inside an extern "C" block also.
As expected, the biggest difference was in the m4 file, which looked like this:
dnl dnl $ Id: $ dnl PHP_ARG_ENABLE(hello, whether to enable hello functions, [ --enable-hello Enable hello support]) if test "$PHP_HELLO" != "no"; then PHP_REQUIRE_CXX AC_LANG_CPLUSPLUS PHP_ADD_LIBRARY(stdc++,,HELLO_SHARED_LIBADD) export OLD_CPPFLAGS="$CPPFLAGS" export CPPFLAGS="$CPPFLAGS $INCLUDES -DHAVE_HELLO" AC_MSG_CHECKING(PHP version) AC_TRY_COMPILE([#include <php_version.h>], [ #if PHP_VERSION_ID < 40000 #error this extension requires at least PHP version 4.0.0 #endif ], [AC_MSG_RESULT(ok)], [AC_MSG_ERROR([need at least PHP 4.0.0])]) export CPPFLAGS="$OLD_CPPFLAGS" PHP_SUBST(HELLO_SHARED_LIBADD) AC_DEFINE(HAVE_HELLO, 1, [ ]) PHP_NEW_EXTENSION(hello, hello.cpp , $ext_shared) fi
So, if you're struggling with the same problem, use CodeGen_PECL, or adapt the m4 sample above (as well as making sure you've used extern "C" in your header and around the ZEND_GET_MODULE macro)
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