Windows下的PHP擴充套件程式設計
阿新 • • 發佈：2019-01-20
PHP 儘管提供了大量有用的函式，但是在特殊情況下還可能需要進行擴充套件程式設計，比如大量的 PECL（PHP Extension Community Library）就是以擴充套件的形式提供的(動態連結庫dll檔案)，它們比 PEAR 的執行效率要高很多。
PHP 擴充套件是用 C 或 C++ 編寫的，需要編譯成動態連線庫 dll 檔案後在 PHP 環境下注冊後才能使用。
編寫 PHP 擴充套件的軟體要求：
VC++6.0 或 VC++.NET 環境。
PHP 的原始碼，需要編譯。
如果不願意編譯 PHP 的原始碼，可以再下載 PHP 的已經編譯成功的二進位制程式碼(就是我們部署 PHP 執行環境的那些檔案包)。注意分別下載的原始檔包和已編譯包，它們的版本必須一致。
過程：
1，安裝 VC++6.0，並選擇把其可執行檔案路徑加入環境變數中，使在命令列環境任意路徑下可以執行編譯器。
2，安裝 PHP 執行環境，並與 IIS 正確整合在一起。假設使用的 PHP 版本為 5.2.5，下載 php-5.2.5-Win32.zip 二進位制包和 php-5.2.5.tar.gz 原始碼包。安裝環境為 C:/php-5.2.5-Win32。分別把原始碼包和二進位制包解壓到該資料夾下。從 php.ini-recommended 拷貝生成一個 php.ini 檔案。
3，建立 C:/php-5.2.5-Win32/Release_TS 資料夾，拷貝 C:/php-5.2.5-Win32/dev/php5ts.lib 檔案到這裡。
4，進入 C:/php-5.2.5-Win32/ext 資料夾，執行命令：
C:/php-5.2.5-Win32/ext>../php.exe ext_skel_win32.php --extname=myphpext
Creating directory myphpext
Creating basic files: config.m4 config.w32 .cvsignore myphpext.c php_myphpext.h
CREDITS EXPERIMENTAL tests/001.phpt myphpext.php [done].
To use your new extension, you will have to execute the following steps:
1. $ cd ..
2. $ vi ext/myphpext/config.m4
3. $ ./buildconf
4. $ ./configure --[with|enable]-myphpext
5. $ make
6. $ ./php -f ext/myphpext/myphpext.php
7. $ vi ext/myphpext/myphpext.c
8. $ make
Repeat steps 3-6 until you are satisfied with ext/myphpext/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.
結果在 ext 下生成一個資料夾 myphpext，包含一個 PHP 擴充套件應用程式設計框架。myphpext 可以任意取名，將來生成的 dll 檔案格式為 php_[extname].dll，我們生成的就是 php_myphpext.dll。執行結果的提示資訊 1.2...8 主要是對 Linux/Unix 環境而言的，我們不必理會。其實 config.m4 檔案在 Windows 下也可能需要修改，但是對於我們簡單的框架暫時還用不著。
資料夾 myphpext 包含若干個檔案，其中：
myphpext.dsp 是工程檔案，後邊還要用；
myphpext.php 擴充套件測試檔案；
php_myphpext.h 擴充套件函式定義標頭檔案
myphpext.c 擴充套件函式具體實現
以上 2 個重要的檔案內容：
php_myphpext.h 檔案：
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 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 |
|
+----------------------------------------------------------------------+
| Author: |
+----------------------------------------------------------------------+
*/
/* $Id: header,v 1.16.2.1.2.1 2007/01/01 19:32:09 iliaa Exp $ */
#ifndef PHP_MYPHPEXT_H
#define PHP_MYPHPEXT_H
extern zend_module_entry myphpext_module_entry;
#define phpext_myphpext_ptr &myphpext_module_entry
#ifdef PHP_WIN32
#define PHP_MYPHPEXT_API __declspec(dllexport)
#else
#define PHP_MYPHPEXT_API
#endif
#ifdef ZTS
#include "TSRM.h"
#endif
PHP_MINIT_FUNCTION(myphpext);
PHP_MSHUTDOWN_FUNCTION(myphpext);
PHP_RINIT_FUNCTION(myphpext);
PHP_RSHUTDOWN_FUNCTION(myphpext);
PHP_MINFO_FUNCTION(myphpext);
PHP_FUNCTION(confirm_myphpext_compiled); /* For testing, remove later. */
PHP_FUNCTION(HelloPHP);
/*
Declare any global variables you may need between the BEGIN
and END macros here:
ZEND_BEGIN_MODULE_GLOBALS(myphpext)
long global_value;
char *global_string;
ZEND_END_MODULE_GLOBALS(myphpext)
*/
/* In every utility function you add that needs to use variables
in php_myphpext_globals, call TSRMLS_FETCH(); after declaring other
variables used by that function, or better yet, pass in TSRMLS_CC
after the last function argument and declare your utility function
with TSRMLS_DC after the last declared argument. Always refer to
the globals in your function as MYPHPEXT_G(variable). You are
encouraged to rename these macros something shorter, see
examples in any other php module directory.
*/
#ifdef ZTS
#define MYPHPEXT_G(v) TSRMG(myphpext_globals_id, zend_myphpext_globals *, v)
#else
#define MYPHPEXT_G(v) (myphpext_globals.v)
#endif
#endif /* PHP_MYPHPEXT_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
myphpext.c 檔案：
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 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 |
|
+----------------------------------------------------------------------+
| Author: |
+----------------------------------------------------------------------+
*/
/* $Id: header,v 1.16.2.1.2.1 2007/01/01 19:32:09 iliaa Exp $ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_myphpext.h"
/* If you declare any globals in php_myphpext.h uncomment this:
ZEND_DECLARE_MODULE_GLOBALS(myphpext)
*/
/* True global resources - no need for thread safety here */
static int le_myphpext;
/* {{{ myphpext_functions[]
*
* Every user visible function must have an entry in myphpext_functions[].
*/
zend_function_entry myphpext_functions[] = {
PHP_FE(confirm_myphpext_compiled, NULL) /* For testing, remove later. */
PHP_FE(HelloPHP, NULL)
{NULL, NULL, NULL} /* Must be the last line in myphpext_functions[] */
};
/* }}} */
/* {{{ myphpext_module_entry
*/
zend_module_entry myphpext_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
STANDARD_MODULE_HEADER,
#endif
"myphpext",
myphpext_functions,
PHP_MINIT(myphpext),
PHP_MSHUTDOWN(myphpext),
PHP_RINIT(myphpext), /* Replace with NULL if there's nothing to do at request start */
PHP_RSHUTDOWN(myphpext), /* Replace with NULL if there's nothing to do at request end */
PHP_MINFO(myphpext),
#if ZEND_MODULE_API_NO >= 20010901
"0.1", /* Replace with version number for your extension */
#endif
STANDARD_MODULE_PROPERTIES
};
/* }}} */
#ifdef COMPILE_DL_MYPHPEXT
ZEND_GET_MODULE(myphpext)
#endif
/* {{{ PHP_INI
*/
/* Remove comments and fill if you need to have entries in php.ini
PHP_INI_BEGIN()
STD_PHP_INI_ENTRY("myphpext.global_value", "42", PHP_INI_ALL, OnUpdateLong, global_value, zend_myphpext_globals, myphpext_globals)
STD_PHP_INI_ENTRY("myphpext.global_string", "foobar", PHP_INI_ALL, OnUpdateString, global_string, zend_myphpext_globals, myphpext_globals)
PHP_INI_END()
*/
/* }}} */
/* {{{ php_myphpext_init_globals
*/
/* Uncomment this function if you have INI entries
static void php_myphpext_init_globals(zend_myphpext_globals *myphpext_globals)
{
myphpext_globals->global_value = 0;
myphpext_globals->global_string = NULL;
}
*/
/* }}} */
/* {{{ PHP_MINIT_FUNCTION
*/
PHP_MINIT_FUNCTION(myphpext)
{
/* If you have INI entries, uncomment these lines
REGISTER_INI_ENTRIES();
*/
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION
*/
PHP_MSHUTDOWN_FUNCTION(myphpext)
{
/* uncomment this line if you have INI entries
UNREGISTER_INI_ENTRIES();
*/
return SUCCESS;
}
/* }}} */
/* Remove if there's nothing to do at request start */
/* {{{ PHP_RINIT_FUNCTION
*/
PHP_RINIT_FUNCTION(myphpext)
{
return SUCCESS;
}
/* }}} */
/* Remove if there's nothing to do at request end */
/* {{{ PHP_RSHUTDOWN_FUNCTION
*/
PHP_RSHUTDOWN_FUNCTION(myphpext)
{
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MINFO_FUNCTION
*/
PHP_MINFO_FUNCTION(myphpext)
{
php_info_print_table_start();
php_info_print_table_header(2, "myphpext support", "enabled");
php_info_print_table_end();
/* Remove comments if you have entries in php.ini
DISPLAY_INI_ENTRIES();
*/
}
/* }}} */
/* Remove the following function when you have succesfully modified config.m4
so that your module can be compiled into PHP, it exists only for testing
purposes. */
/* Every user-visible function in PHP should document itself in the source */
/* {{{ proto string confirm_myphpext_compiled(string arg)
Return a string to confirm that the module is compiled in */
PHP_FUNCTION(confirm_myphpext_compiled)
{
char *arg = NULL;
int arg_len, len;
char *strg;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {
return;
}
len = spprintf(&strg, 0, "Congratulations! You have successfully modified ext/%.78s/config.m4. Module %.78s is now compiled into PHP.", "myphpext", arg);
RETURN_STRINGL(strg, len, 0);
}
PHP_FUNCTION(HelloPHP)
{
php_printf("Hello, PHP v5.2.5 - 2008-3-28");
}
/* }}} */
/* The previous line is meant for vim and emacs, so it can correctly fold and
unfold functions in source code. See the corresponding marks just before
function definition, where the functions purpose is also documented. Please
follow this convention for the convenience of others editing your code.
*/
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
注意本例定義了一個函式 HelloPHP。在 php_myphpext.h 檔案中定義：
PHP_FUNCTION(HelloPHP);
在 myphpext.c 中有 2 處地方：
PHP_FE(HelloPHP, NULL) 語句把我們自己的函式加入入口陣列中。
以下定義了 HelloPHP 函式的內容:
PHP_FUNCTION(HelloPHP)
{
php_printf("Hello, PHP v5.2.5 - 2008-3-28");
}
其實還有個 confirm_myphpext_compiled 函式，是自動產生的，用於測試，與我們的自定義函式用法一模一樣。
5，編譯、連結，生成最終的檔案。
C:/php-5.2.5-Win32/ext>msdev myphpext/myphpext.dsp /MAKE "myphpext - Win32 Release_TS"
-----------Configuration: myphpext - Win32 Release_TS-----------
Compiling...
myphpext.c
Linking...
Creating library Release_TS/php_myphpext.lib and object Release_TS/php_myphpext.exp
php_myphpext.dll - 0 error(s), 0 warning(s)
最終在 C:/php-5.2.5-Win32/Release_TS 下生成了擴充套件庫 php_myphpext.dll。
6，部署：
把 php_myphpext.dll 拷貝到 C:/php-5.2.5-Win32/ext 資料夾下。修改 php.ini 檔案：
加語句 extension=php_myphpext.dll。
再注意 extension 路徑的指向，需要把 ;extension_dir = "./" 語句的註釋去掉，再修改為 extension_dir = "C:/php-5.2.5-Win32/ext"。
最後一定要重啟 IIS 伺服器。
7，測試：
把 myphpext.php 拷貝到 Web 伺服器根下（myphpext.php 的程式碼也值得一看），在本機用瀏覽器開啟：http://localhost/myphpext.php，應該能看到以下資訊：
Functions available in the test extension:
confirm_myphpext_compiled
HelloPHP
Congratulations! You have successfully modified ext/myphpext/config.m4. Module myphpext is now compiled into PHP.
再建立一個 test.php 檔案，內容為：
<?php
HelloPHP();
?>
用本機瀏覽器開啟：http://localhost/test.php，應該能看到以下資訊：
Hello, PHP v5.2.5 - 2008-3-28
這說明我們所有的步驟都是正確的，已經生成了一個自己的 PHP 擴充套件函式庫。只要對 C 語言熟悉，就可以編寫大量的自定義函式，供所有人呼叫。注意，不像 PEAR 等函式庫，需要首先在 PHP 程式碼裡指定其檔名才能使用其中的函式和類。PHP 擴充套件的函式不是用 PHP 語言自身開發的，而是 C 開發的，而且可以直接在 PHP 程式碼裡呼叫。這樣既有一定的保密性，還有效率上的優勢。
開發 PHP 擴充套件的更多示例可以參考 PHP 的原始碼，或者其它的 PECL 原始碼。從那裡可以學習到大量的技巧。
PHP 擴充套件是用 C 或 C++ 編寫的，需要編譯成動態連線庫 dll 檔案後在 PHP 環境下注冊後才能使用。
編寫 PHP 擴充套件的軟體要求：
VC++6.0 或 VC++.NET 環境。
PHP 的原始碼，需要編譯。
如果不願意編譯 PHP 的原始碼，可以再下載 PHP 的已經編譯成功的二進位制程式碼(就是我們部署 PHP 執行環境的那些檔案包)。注意分別下載的原始檔包和已編譯包，它們的版本必須一致。
過程：
1，安裝 VC++6.0，並選擇把其可執行檔案路徑加入環境變數中，使在命令列環境任意路徑下可以執行編譯器。
2，安裝 PHP 執行環境，並與 IIS 正確整合在一起。假設使用的 PHP 版本為 5.2.5，下載 php-5.2.5-Win32.zip 二進位制包和 php-5.2.5.tar.gz 原始碼包。安裝環境為 C:/php-5.2.5-Win32。分別把原始碼包和二進位制包解壓到該資料夾下。從 php.ini-recommended 拷貝生成一個 php.ini 檔案。
3，建立 C:/php-5.2.5-Win32/Release_TS 資料夾，拷貝 C:/php-5.2.5-Win32/dev/php5ts.lib 檔案到這裡。
4，進入 C:/php-5.2.5-Win32/ext 資料夾，執行命令：
C:/php-5.2.5-Win32/ext>../php.exe ext_skel_win32.php --extname=myphpext
Creating directory myphpext
Creating basic files: config.m4 config.w32 .cvsignore myphpext.c php_myphpext.h
CREDITS EXPERIMENTAL tests/001.phpt myphpext.php [done].
To use your new extension, you will have to execute the following steps:
1. $ cd ..
2. $ vi ext/myphpext/config.m4
3. $ ./buildconf
4. $ ./configure --[with|enable]-myphpext
5. $ make
6. $ ./php -f ext/myphpext/myphpext.php
7. $ vi ext/myphpext/myphpext.c
8. $ make
Repeat steps 3-6 until you are satisfied with ext/myphpext/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.
結果在 ext 下生成一個資料夾 myphpext，包含一個 PHP 擴充套件應用程式設計框架。myphpext 可以任意取名，將來生成的 dll 檔案格式為 php_[extname].dll，我們生成的就是 php_myphpext.dll。執行結果的提示資訊 1.2...8 主要是對 Linux/Unix 環境而言的，我們不必理會。其實 config.m4 檔案在 Windows 下也可能需要修改，但是對於我們簡單的框架暫時還用不著。
資料夾 myphpext 包含若干個檔案，其中：
myphpext.dsp 是工程檔案，後邊還要用；
myphpext.php 擴充套件測試檔案；
php_myphpext.h 擴充套件函式定義標頭檔案
myphpext.c 擴充套件函式具體實現
以上 2 個重要的檔案內容：
php_myphpext.h 檔案：
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 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 |
|
+----------------------------------------------------------------------+
| Author: |
+----------------------------------------------------------------------+
*/
/* $Id: header,v 1.16.2.1.2.1 2007/01/01 19:32:09 iliaa Exp $ */
#ifndef PHP_MYPHPEXT_H
#define PHP_MYPHPEXT_H
extern zend_module_entry myphpext_module_entry;
#define phpext_myphpext_ptr &myphpext_module_entry
#ifdef PHP_WIN32
#define PHP_MYPHPEXT_API __declspec(dllexport)
#else
#define PHP_MYPHPEXT_API
#endif
#ifdef ZTS
#include "TSRM.h"
#endif
PHP_MINIT_FUNCTION(myphpext);
PHP_MSHUTDOWN_FUNCTION(myphpext);
PHP_RINIT_FUNCTION(myphpext);
PHP_RSHUTDOWN_FUNCTION(myphpext);
PHP_MINFO_FUNCTION(myphpext);
PHP_FUNCTION(confirm_myphpext_compiled); /* For testing, remove later. */
PHP_FUNCTION(HelloPHP);
/*
Declare any global variables you may need between the BEGIN
and END macros here:
ZEND_BEGIN_MODULE_GLOBALS(myphpext)
long global_value;
char *global_string;
ZEND_END_MODULE_GLOBALS(myphpext)
*/
/* In every utility function you add that needs to use variables
in php_myphpext_globals, call TSRMLS_FETCH(); after declaring other
variables used by that function, or better yet, pass in TSRMLS_CC
after the last function argument and declare your utility function
with TSRMLS_DC after the last declared argument. Always refer to
the globals in your function as MYPHPEXT_G(variable). You are
encouraged to rename these macros something shorter, see
examples in any other php module directory.
*/
#ifdef ZTS
#define MYPHPEXT_G(v) TSRMG(myphpext_globals_id, zend_myphpext_globals *, v)
#else
#define MYPHPEXT_G(v) (myphpext_globals.v)
#endif
#endif /* PHP_MYPHPEXT_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
myphpext.c 檔案：
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2007 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 |
|
+----------------------------------------------------------------------+
| Author: |
+----------------------------------------------------------------------+
*/
/* $Id: header,v 1.16.2.1.2.1 2007/01/01 19:32:09 iliaa Exp $ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_myphpext.h"
/* If you declare any globals in php_myphpext.h uncomment this:
ZEND_DECLARE_MODULE_GLOBALS(myphpext)
*/
/* True global resources - no need for thread safety here */
static int le_myphpext;
/* {{{ myphpext_functions[]
*
* Every user visible function must have an entry in myphpext_functions[].
*/
zend_function_entry myphpext_functions[] = {
PHP_FE(confirm_myphpext_compiled, NULL) /* For testing, remove later. */
PHP_FE(HelloPHP, NULL)
{NULL, NULL, NULL} /* Must be the last line in myphpext_functions[] */
};
/* }}} */
/* {{{ myphpext_module_entry
*/
zend_module_entry myphpext_module_entry = {
#if ZEND_MODULE_API_NO >= 20010901
STANDARD_MODULE_HEADER,
#endif
"myphpext",
myphpext_functions,
PHP_MINIT(myphpext),
PHP_MSHUTDOWN(myphpext),
PHP_RINIT(myphpext), /* Replace with NULL if there's nothing to do at request start */
PHP_RSHUTDOWN(myphpext), /* Replace with NULL if there's nothing to do at request end */
PHP_MINFO(myphpext),
#if ZEND_MODULE_API_NO >= 20010901
"0.1", /* Replace with version number for your extension */
#endif
STANDARD_MODULE_PROPERTIES
};
/* }}} */
#ifdef COMPILE_DL_MYPHPEXT
ZEND_GET_MODULE(myphpext)
#endif
/* {{{ PHP_INI
*/
/* Remove comments and fill if you need to have entries in php.ini
PHP_INI_BEGIN()
STD_PHP_INI_ENTRY("myphpext.global_value", "42", PHP_INI_ALL, OnUpdateLong, global_value, zend_myphpext_globals, myphpext_globals)
STD_PHP_INI_ENTRY("myphpext.global_string", "foobar", PHP_INI_ALL, OnUpdateString, global_string, zend_myphpext_globals, myphpext_globals)
PHP_INI_END()
*/
/* }}} */
/* {{{ php_myphpext_init_globals
*/
/* Uncomment this function if you have INI entries
static void php_myphpext_init_globals(zend_myphpext_globals *myphpext_globals)
{
myphpext_globals->global_value = 0;
myphpext_globals->global_string = NULL;
}
*/
/* }}} */
/* {{{ PHP_MINIT_FUNCTION
*/
PHP_MINIT_FUNCTION(myphpext)
{
/* If you have INI entries, uncomment these lines
REGISTER_INI_ENTRIES();
*/
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION
*/
PHP_MSHUTDOWN_FUNCTION(myphpext)
{
/* uncomment this line if you have INI entries
UNREGISTER_INI_ENTRIES();
*/
return SUCCESS;
}
/* }}} */
/* Remove if there's nothing to do at request start */
/* {{{ PHP_RINIT_FUNCTION
*/
PHP_RINIT_FUNCTION(myphpext)
{
return SUCCESS;
}
/* }}} */
/* Remove if there's nothing to do at request end */
/* {{{ PHP_RSHUTDOWN_FUNCTION
*/
PHP_RSHUTDOWN_FUNCTION(myphpext)
{
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MINFO_FUNCTION
*/
PHP_MINFO_FUNCTION(myphpext)
{
php_info_print_table_start();
php_info_print_table_header(2, "myphpext support", "enabled");
php_info_print_table_end();
/* Remove comments if you have entries in php.ini
DISPLAY_INI_ENTRIES();
*/
}
/* }}} */
/* Remove the following function when you have succesfully modified config.m4
so that your module can be compiled into PHP, it exists only for testing
purposes. */
/* Every user-visible function in PHP should document itself in the source */
/* {{{ proto string confirm_myphpext_compiled(string arg)
Return a string to confirm that the module is compiled in */
PHP_FUNCTION(confirm_myphpext_compiled)
{
char *arg = NULL;
int arg_len, len;
char *strg;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {
return;
}
len = spprintf(&strg, 0, "Congratulations! You have successfully modified ext/%.78s/config.m4. Module %.78s is now compiled into PHP.", "myphpext", arg);
RETURN_STRINGL(strg, len, 0);
}
PHP_FUNCTION(HelloPHP)
{
php_printf("Hello, PHP v5.2.5 - 2008-3-28");
}
/* }}} */
/* The previous line is meant for vim and emacs, so it can correctly fold and
unfold functions in source code. See the corresponding marks just before
function definition, where the functions purpose is also documented. Please
follow this convention for the convenience of others editing your code.
*/
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
注意本例定義了一個函式 HelloPHP。在 php_myphpext.h 檔案中定義：
PHP_FUNCTION(HelloPHP);
在 myphpext.c 中有 2 處地方：
PHP_FE(HelloPHP, NULL) 語句把我們自己的函式加入入口陣列中。
以下定義了 HelloPHP 函式的內容:
PHP_FUNCTION(HelloPHP)
{
php_printf("Hello, PHP v5.2.5 - 2008-3-28");
}
其實還有個 confirm_myphpext_compiled 函式，是自動產生的，用於測試，與我們的自定義函式用法一模一樣。
5，編譯、連結，生成最終的檔案。
C:/php-5.2.5-Win32/ext>msdev myphpext/myphpext.dsp /MAKE "myphpext - Win32 Release_TS"
-----------Configuration: myphpext - Win32 Release_TS-----------
Compiling...
myphpext.c
Linking...
Creating library Release_TS/php_myphpext.lib and object Release_TS/php_myphpext.exp
php_myphpext.dll - 0 error(s), 0 warning(s)
最終在 C:/php-5.2.5-Win32/Release_TS 下生成了擴充套件庫 php_myphpext.dll。
6，部署：
把 php_myphpext.dll 拷貝到 C:/php-5.2.5-Win32/ext 資料夾下。修改 php.ini 檔案：
加語句 extension=php_myphpext.dll。
再注意 extension 路徑的指向，需要把 ;extension_dir = "./" 語句的註釋去掉，再修改為 extension_dir = "C:/php-5.2.5-Win32/ext"。
最後一定要重啟 IIS 伺服器。
7，測試：
把 myphpext.php 拷貝到 Web 伺服器根下（myphpext.php 的程式碼也值得一看），在本機用瀏覽器開啟：http://localhost/myphpext.php，應該能看到以下資訊：
Functions available in the test extension:
confirm_myphpext_compiled
HelloPHP
Congratulations! You have successfully modified ext/myphpext/config.m4. Module myphpext is now compiled into PHP.
再建立一個 test.php 檔案，內容為：
<?php
HelloPHP();
?>
用本機瀏覽器開啟：http://localhost/test.php，應該能看到以下資訊：
Hello, PHP v5.2.5 - 2008-3-28
這說明我們所有的步驟都是正確的，已經生成了一個自己的 PHP 擴充套件函式庫。只要對 C 語言熟悉，就可以編寫大量的自定義函式，供所有人呼叫。注意，不像 PEAR 等函式庫，需要首先在 PHP 程式碼裡指定其檔名才能使用其中的函式和類。PHP 擴充套件的函式不是用 PHP 語言自身開發的，而是 C 開發的，而且可以直接在 PHP 程式碼裡呼叫。這樣既有一定的保密性，還有效率上的優勢。
開發 PHP 擴充套件的更多示例可以參考 PHP 的原始碼，或者其它的 PECL 原始碼。從那裡可以學習到大量的技巧。