1、cd ext

2、./ext_skel --extname=helloworld

3、vim config.m4

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

4、/usr/local/php-7.1.0/bin/phpize

5、vim helloworld.c

/*
 *  #define ZEND_FN(name) zif_##name
 *  #define ZEND_MN(name) zim_##name
 *  #define ZEND_NAMED_FUNCTION(name)   void name(INTERNAL_FUNCTION_PARAMETERS)
 *  #define ZEND_FUNCTION(name)         ZEND_NAMED_FUNCTION(ZEND_FN(name))
 *  #define INTERNAL_FUNCTION_PARAMETERS zend_execute_data *execute_data, zval *return_value
 *
 *实际上宏替换的函数为
*  zif_helloworld(zend_execute_data *execute_data, zval *return_value)

 *
 * */

PHP_FUNCTION(confirm_helloworld_compiled)
{       
        char *arg = NULL;
        size_t arg_len, len;
        zend_string *strg;
        /*
		* zend_parse_parameters 是 confirm_helloworld_compiled 所传的参数
		*/
        if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &arg, &arg_len) == FAILURE) {
                return;
        }
                strg = strpprintf(0, "Congratulations! You have successfully modified ext/%.78s/config.m4. Module %.78s is now compiled into PHP.", "helloworld", arg);

        RETURN_STR(strg);
}

把函数名改掉 confirm_helloworld_compiled 为helloworld
PHP_FUNCTION(改为helloworld)

const zend_function_entry helloworld_functions[] = {
        PHP_FE(helloworld,      NULL)           /* For testing, remove later. */
        PHP_FE_END      /* Must be the last line in helloworld_functions[] */
};

6、./configure --with-php-config=/usr/local/php-7.1.0/bin/php-config

7、make && make install

8、修改php.ini

extension=helloworld.so

设置php的配置文件
未设置php配置文件时输入php --ini命令，会出现
[root@liangzai~]# php --ini
Configuration File (php.ini) Path: /usr/local/php/lib
Loaded Configuration File: (none)
Scan for additional .ini files in: (none)
Additional .ini files parsed: (none)
在opt的php安装目录下有这两个文件，将其中的production复制到/usr/local/php/lib目录cp /opt/php-7.1.0/php.ini-production /usr/local/php/lib
/opt/php-7.1.0/php.ini-development
/opt/php-7.1.0/php.ini-production
将php.ini-production重命名为php.ini，再次输入php –ini命令(可以看到已经加载了配置文件，稍后再做具体配置)