php扩展作为 php的高级应用，再对于特有的业务逻辑，通过编写扩展能大大提升执行效率。
再潜意识里任务PHP扩展是一件非常高级的工作，对其望而却步。真正硬着头皮，做了后才发现soeasy！
下面来演示一下php扩展的编写。
当前的php 版本为5.6
第一步环境准备：
- download php的源码。（不详说 php.net直接下）
- 解压后 按照步骤安装需要的模块。
- 一个可用的php环境已经有了，想要丰富php扩展。进入ext 目录。
没错！你会看到很多内置的扩展 curl、json、mcrypt等等。。
4.我们就是要编写和他们一样的插件。鸟哥教我们要多看看已有的扩展，对我们的以后编写肯定有帮助
第二步 编写自己的扩展：
ext_skel 这是一个已经存在的扩展框架生成工具
- ./ext_skel –extname=fengjie
- cd fengjie
- vi config.m4
- 放开 10,11，12行的注释（dnl） 即删除 PHP_ARG_WITH函数前的dnl 保存
- vi fengjie.c
注册自己的函数。
- 编写自己的函数。第一次可以抄一下已有的confirm_fengjie_compiled
ok 两步就编写完成了。
下面就是 通用的编译安装扩展 的通用方法
php5.3 以后提供了phpize工具
因此 安装方法：
- cd /home/users/fengjie03/src/php-5.6.9/ext/fengjie/
- /home/users/fengjie03/php/bin/phpize
- ./configure –with-php-config=/home/users/fengjie03/php/bin/php-config
- make
- make install
- vi /home/users/fengjie03/php/etc/php. ini 添加 fengjie.so
ok 安装完成 看一下是否成功
/home/users/fengjie03/php/bin/php -m | grep ‘fengjie’
bingo!!
一段测试代码：
<?php
echo “< pre >”;
print_r(get_loaded_extensions());
print_r(get_extension_funcs(‘fengjie’));
echo fengjie_test(‘My first php extension’);
echo “</pre>”;
恭喜你 已经get 里php扩展的技能！
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