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解析参数,这一步通过zend_parse_parameters函数实现,这个函数的作用是从函数用户的输入栈中读取数据,然后转换成相应的函数参数填入变量以供后面核心功能代码使用。zend_parse_parameters的第一个参数是用户传入参数的个数,可以由宏“ZEND_NUM_ARGS() TSRMLS_CC”生成;第二个参数是一个字符串,其中每个字母代表一个变量类型,我们只有一个字符串型变量,所以第二个参数是“s”;最后各个参数需要一些必要的局部变量指针用于存储数据,下表给出了不同变量类型的字母代表及其所需要的局部变量指针。
参数解析完成后就是核心功能代码,我们这里只是输出一行字符,php_printf是Zend版本的printf。
最后的返回值也是通过宏实现的。RETURN_TRUE宏是返回布尔值“true”。
使用宏ZEND_BEGIN_ARG_INFO和ZEND_END_ARG_INFO定义参数信息
参数信息是函数所必要部分,这里不做深究,直接给出相应代码:
ZEND_BEGIN_ARG_INFO(arginfo_say_hello_func, 0) ZEND_END_ARG_INFO() 如需了解具体信息请阅读相关宏定义。
使用宏PHP_FE将函数加入到say_hello_functions中
最后,我们需要将刚才定义的函数和参数信息加入到say_hello_functions数组里,代码如下:
const zend_function_entry say_hello_functions[] = { PHP_FE(say_hello_func, arginfo_say_hello_func) {NULL, NULL, NULL} }; 这一步就是通过PHP_EF宏实现,注意这个数组最后一行必须是{NULL, NULL, NULL} ,请不要删除。
下面是编写完成后的say_hello.c全部代码:
/* +---------------------------------------------------------------------+ | PHP Version 5 | +----------------------------------------------------------------------+ | Copyright (c) 1997-2010 The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | http://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Author: | +----------------------------------------------------------------------+ */ /* $Id: header 297205 2010-03-30 21:09:07Z johannes ___FCKpd___14nbsp;*/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "php.h" #include "php_ini.h" #include "ext/standard/info.h" #include "php_say_hello.h" /* If you declare any globals in php_say_hello.h uncomment this: ZEND_DECLARE_MODULE_GLOBALS(say_hello) */ /* True global resources - no need for thread safety here */ static int le_say_hello; /* {{{ PHP_FUNCTION */ PHP_FUNCTION(say_hello_func) { char *name; int name_len; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &name, &name_len) == FAILURE) { return; } php_printf("Hello %s!", name); RETURN_TRUE; } ZEND_BEGIN_ARG_INFO(arginfo_say_hello_func, 0) ZEND_END_ARG_INFO() /* }}} */ /* {{{ say_hello_functions[] * * Every user visible function must have an entry in say_hello_functions[]. */ const zend_function_entry say_hello_functions[] = { PHP_FE(say_hello_func, arginfo_say_hello_func) {NULL, NULL, NULL} /* Must be the last line in say_hello_functions[] */ }; /* }}}*/ /* {{{ say_hello_module_entry */ zend_module_entry say_hello_module_entry = { #if ZEND_MODULE_API_NO >= 20010901 STANDARD_MODULE_HEADER, #endif "say_hello", say_hello_functions, NULL, NULL, NULL, NULL, PHP_MINFO(say_hello), #if ZEND_MODULE_API_NO >= 20010901 "0.1", /* Replace with version number for your extension */ #endif STANDARD_MODULE_PROPERTIES }; /* }}} */ #ifdef COMPILE_DL_SAY_HELLO ZEND_GET_MODULE(say_hello) #endif /* {{{ PHP_MINFO_FUNCTION */ PHP_MINFO_FUNCTION(say_hello) &nb