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HomeBackend DevelopmentPHP Tutorial高速开发一个PHP扩展(SO组件)教程

快速开发一个PHP扩展(SO组件)教程
本文通过非常快速的方式讲解了如何制作一个PHP 5.2 环境的扩展(PHP Extension),希望能够在图文的方式下让想快速学习的朋友了解一下制作过程。

需求:比如开发一个叫做 lanhaicode 的扩展,扩展里就一个函数 lanhai_test(),输入一个字符串,函数返回:Your input string: xxxxx。
要求:了解C/C++编程,熟悉PHP编程
环境:下载一份php对应版本的源码,我这里是 php-5.2.17,先正常安装php,假设我们的php安装在 /usr/local/php 目录,源码在 /root/soft/php/php-5.2.17/,现在开始!
php-5.2.17下载地址:
http://blog.lrenwang.com/down/soft/php-5.2.17.tar.bz2
解压: tar -vxjf php-5......tar.bz2


步骤一:生成扩展框架

cd /root/soft/php/php-5.2.17/ext./ext_skel --extname=lanhaicodecd /root/soft/php/php-5.2.17/ext/lanhaicodevi config.m4

打开文件后去掉 dnl ,获得下面的信息:
PHP_ARG_ENABLE(lanhaicode, whether to enable lanhaicode support,[ --enable-lanhaicode Enable lanhaicode support])

保存退出.
第二步:编写代码
vi php_lanhaicode.h

找到:PHP_FUNCTION(confirm_lanhaicode_compiled); 新增一行:
PHP_FUNCTION(lanhai_test); 

保存退出。

vi lanhaicode.c

数组里增加我们的函数,找到 zend_function_entry lanhaicode_functions[],增加:
PHP_FE(lanhaicode, NULL)


再到 lanhaicode.c 文件最后面增加如下代码:
PHP_FUNCTION(lanhai_test){char *arg = NULL;int arg_len, len;char *strg;if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {return;}len = spprintf(&strg, 0, "Your input string: %s\n", arg);RETURN_STRINGL(strg, len, 0);}

保存退出。

第三步:编译安装

cd /root/soft/php/php-5.2.17/ext/lanhaicode/usr/local/php/bin/phpize./configure --with-php-config=/usr/local/php/bin/php-configmakemake testmake install


./configure过程中出现如下错误:
checking for gcc... no
checking for cc... no
checking for cc... no
checking for cl... no
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details.

解决办法:安装GCC软件套件,执行命令:
yum install -y gcc


现在看看是不是有个 /usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/lanhaicode.so
编辑php.ini,把扩展加入进去:
vi /usr/local/php/lib/php.ini

在[PHP]模块下增加:
extension = lanhaicode.so
保存退出。

注意:如果你不存在扩展文件目录,或者安装报错,那么可以自行建立这个目录,然后把扩展拷贝到目录下,然后记得把 php.ini 文件中的 extension_dir 修改为该目录:
extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/"

第四步:检查安装结果
现在看看模块加载了没有:
/usr/local/php/bin/php -m,应该会打印出:
[PHP Modules]
...
lanhaicode
...
[Zend Modules]


然后重启apache,输出 phpinfo() ,应该能够看到:
lanhaicode
lanhaicode support enabled

看看函数是否存在并且调用,在web目录下建立:lanhaicode.php
<?phpecho "<pre class="brush:php;toolbar:false">";print_r(get_loaded_extensions());print_r(get_extension_funcs('lanhaicode'));echo lanhai_test('My first php extension');echo "
";?>

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