用C兑现PHP扩展类
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2022-05-17 19:37:49
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用C实现PHP扩展类
2，修改编译参数
3，编写C代码
前面简单介绍了用C语言实现PHP扩展的步骤，见用C开发PHP扩展的步骤，那个是扩展一个函数，这里讲述一下如何用C扩展类。
准备实现的类如下：
class Rectangle{ private $_width; private $_height; public function __construct($width, $height){ $this->_width = $width; $this->_height = $height; } public function clone(){ return new Rectangle($this->_width, $this->_height); } public function setWidth($width){ $this->_width = $width; } public function setHeight($height){ $this->_height = $height; } public function getWidth(){ return $this->_width; } public function getHeight(){ return $this->_height; } public function getArea(){ return $this->_width * $this->_height; } public function getCircle(){ return ($this->_width + $this->_height) * 2; }}
实现类扩展的步骤如下：（首先下载PHP源码，这里使用的是php-5.2.8）
1，建立扩展骨架
cd php-5.2.8/ext./ext_skel --extname=class_ext
2，修改编译参数
cd php-5.2.8/ext/class_extvi config.m4去掉PHP_ARG_ENABLE(class_ext, whether to enable class_ext support,和
[ --enable-class_ext Enable class_ext support])两行前面的dnl，修改后为：
dnl Otherwise use enable: PHP_ARG_ENABLE(class_ext, whether to enable class_ext support, dnl Make sure that the comment is aligned: [ --enable-class_ext Enable class_ext support])
3，编写C代码
cd php-5.2.8/ext/class_extvi php_class_ext.h#在 PHP_FUNCTION(confirm_class_ext_compiled); 后面增加申明函数;
PHP_METHOD(Rectangle,__construct);PHP_METHOD(Rectangle,clone);PHP_METHOD(Rectangle,setWidth);PHP_METHOD(Rectangle,setHeight);PHP_METHOD(Rectangle,getWidth);PHP_METHOD(Rectangle,getHeight);PHP_METHOD(Rectangle,getArea);PHP_METHDO(Rectangle,getCircle);
vi class_ext.c#申明方法的参数，注册到函数表中
ZEND_BEGIN_ARG_INFO(arg_construct,2)ZEND_ARG_INFO(0, width)ZEND_ARG_INFO(0, height)ZEND_END_ARG_INFO()ZEND_BEGIN_ARG_INFO(arg_set_width,1)ZEND_ARG_INFO(0, width)ZEND_END_ARG_INFO()ZEND_BEGIN_ARG_INFO(arg_set_height,1)ZEND_ARG_INFO(0, height)ZEND_END_ARG_INFO()const zend_function_entry class_ext_functions[] = { PHP_FE(confirm_class_ext_compiled, NULL) PHP_ME(Rectangle, __construct, arg_construct, ZEND_ACC_CTOR|ZEND_ACC_PUBLIC) PHP_ME(Rectangle, clone, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, setWidth, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, setHeight, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, getWidth, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, getHeight, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, getArea, NULL, ZEND_ACC_PUBLIC) PHP_ME(Rectangle, getCircle, NULL, ZEND_ACC_PUBLIC) {NULL, NULL, NULL} /* Must be the last line in class_ext_functions[] */};
#其中ZEND_ACC_CTOR表示构造函数，ZEND_ACC_PUBLIC表示访问权限为PUBLIC。
#接下来，在模块初始化函数中注册并初始化类
zend_class_entry *Rectangle_ce; //zend内部类结构变量PHP_MINIT_FUNCTION(class_ext){ zend_class_entry Rectangle; INIT_CLASS_ENTRY(Rectanble, "Rectangle", class_ext_functions); //第二个参数为类名，第三个参数为类的函数列表 Rectangle_ce = zend_register_internal_class_ex(&Rectangle, NULL, NULL TSRMLS_CC); //注册类 zend_declare_property_null(Rectangle_ce, ZEND_STRL("_width"), ZEND_ACC_PRIVATE TSRMLS_CC); //初始化类的属性_width zend_declare_property_null(Rectangle_ce, ZEND_STRL("_height"), ZEND_ACC_PRIVATE TSRMLS_CC); //初始化类的属性_height return SUCCESS;}
#在文件最后增加类的成员函数的具体实现代码
PHP_METHOD(Rectangle, __construct){ long width,height; if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &width, &height) == FAILURE){ //获取构造函数的两个函数参数_width和_height WRONG_PARAM_COUNT; } if( width
4，编译代码
cd php-5.2.8/ext/class_ext/usr/local/php/bin/phpize./configure --with-php-config=/usr/local/php/bin/php-configmake make install
此时会在php的安装路径下产生一个so文件，比如
/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/class_ext.so
修改php.ini 添加扩展extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/"
[class_ext]
extension = class_ext.so
5，测试代码
$width = -10;$height = 12;$rectangle = new Rectangle($width, $height);$area = $rectangle->getArea();var_dump($area);$circle = $rectangle->getCircle();var_dump($circle);$clone = $rectangle->clone();$_area = $clone->getArea();var_dump($_area);$clone->setWidth(100);$clone->setHeight(200);$_area = $clone->getArea();var_dump($_area);$width = $clone->getWidth();var_dump($width);$height = $clone->getHeight();var_dump($height);
结果输出：
int(12)int(26)int(12)int(20000)int(100)int(200)
6，Over！
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