准备环境

• 本次开发使用ubuntu 14.04

• php 7.1，从github clone到本地

创建扩展项目

1、进入到php-src目录，cd ext，执行命令.ext_skel --extname=helloworld
输出以下内容：

To use your new extension, you will have to execute the following steps:

1. $ cd ..

2. $ vi ext/myext/config.m4

3. $ ./buildconf

4. $ ./configure --[with|enable]-myext

5. $ make

6. $ ./sapi/cli/php -f ext/myext/myext.php

7. $ vi ext/myext/myext.c

8. $ make

Repeat steps 3-6 until you are satisfied with ext/myext/config.m4 and
step 6 confirms that your module is compiled into PHP. Then, start writing
code and repeat the last two steps as often as necessary.

注意，如果使用homestead虚拟机来进行开发，一定要注意文件格式问题。在homestead中执行上述命令可能会出现下面的错误提示：

./ext_skel --extname=<extname>

-bash: ./ext_skel: /bin/sh^M: bad interpreter: No such file or directory

解决方案：用notepad++打开ext_skel文件，打开设置>首选项，按下图更改设置：

Creating directory myext
Creating basic files: config.m4 config.w32 .gitignore myext.c php_myext.h CREDITS EXPERIMENTAL tests/001.phpt myext.php [done].

2、打开config.m4，将10到12行的代码注释去掉，如下

PHP_ARG_WITH(helloworld, for helloworld support,
dnl Make sure that the comment is aligned:
[  --with-helloworld             Include helloworld support])

3、打开helloworld.c，添加hello world导出函数，同时添加到编译列表里面

PHP_FUNCTION(my_hello_world)
{
    php_printf("zshanjun hell world");
    RETURN_TRUE;
}

const zend_function_entry helloworld_functions[] = {
        PHP_FE(confirm_helloworld_compiled,     NULL) 
        PHP_FE(my_hello_world,              NULL)         
        PHP_FE_END      /* Must be the last line in helloworld_functions[] */
};

4、使用一下命令对helloworld扩展进行编译

phpize  //用来生成配置文件
./configure --with-php-config=php-config 
make
make install

5、设置php.ini文件，添加一行extension=helloworld.so
ps: php.ini位置 /etc/php/7.0/fpm/php.ini
ps: sudo service php7.0-fpm restart重启php-fpm

6、查看成果
在一个php页面中直接调用echo my_hello_world()即可

参考网站：

• PHP7扩展开发(一)：hello world

• PHP扩展开发--01.编写一个helloWorld扩展

• PHP核心技术与最佳实践-列旭松

• 列旭松扩展开发知乎live

• -bash: ./my_script: /bin/bash^M: bad interpreter: No such file or directory