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A brief analysis of the basics of PHP Extension development (3)_PHP tutorial

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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。

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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

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