链接用C语言编写的PHP扩展 [英] Linking a PHP Extension Written in C

问题描述

修改我的问题

在C语言中构建外部PHP模块时，如何链接共享对象?

When building an external PHP module in C, how do I link shared objects?

推荐答案

如果您的C扩展代码使用共享库，则需要在config.m4文件中声明它.

If your C extension code uses a shared library, you need to declare that in the config.m4 file.

我强烈建议使用 ext_skel 脚本包含在PHP源代码中以生成框架config.m4:

I strongly recommend using the ext_skel script that's included in the PHP source to generate a skeleton config.m4:

./ext_skel --extname=myextension

由于要链接到库，因此按照惯例，应使用--with-myextension选项(而不是--enable-myextension).取消注释config.m4中的相关行，并填写您的lib的详细信息.

Since you're linking to a library, by convention you should use the --with-myextension options (as opposed to --enable-myextension). Uncomment the relevant lines in the config.m4 and fill in the details of your lib.

类似以下内容:

  # --with-myextension -> check for lib and symbol presence
  LIBNAME=the_lib_your_extension_needs # you may want to change this
  LIBSYMBOL=some_symbol_in_the_lib_you_extension_needs # you most likely want to change this 

  PHP_CHECK_LIBRARY($LIBNAME,$LIBSYMBOL,
  [
    PHP_ADD_LIBRARY_WITH_PATH($LIBNAME, $MYEXTENSION_DIR/lib, MYEXTENSION_SHARED_LIBADD)
    AC_DEFINE(HAVE_MYEXTENSIONLIB,1,[ ])
  ],[
    AC_MSG_ERROR([wrong $LIBNAME lib version or lib not found])
  ],[
    -L$MYEXTENSION_DIR/lib -ldl
  ])

然后构建它，运行:

phpize
./configure --with-myextension
make

最后，您需要将模块(或ln -s)复制到系统希望找到它的位置.

Finally you need to copy your module (or ln -s) to wherever your system expects to find it.

如果一切正常，那么php -m应将您的模块包括在列表中.

If that all worked then php -m should include your module in the list.

不幸的是，我从未在网上找到关于PHP的config.m4命令的很好的参考-有关该书的信息是 Sara Golemon的扩展和嵌入PHP 以及乔治·施洛斯纳格(George Schlossnagle)的高级PHP编程.

Unfortunately I've never found a good online reference to PHP's config.m4 commands - the books for this are Sara Golemon's Extending and Embedding PHP and also parts of George Schlossnagle's Advanced PHP Programming.

Sara Goleman提供了一个合理的初学者指南来创建PHP扩展在这里，但是对于肉类，您真的需要她的书.

There's a reasonable beginners guide to creating PHP extensions by Sara Goleman here, but for the meat you really need her book.

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