欢迎进入C/C++编程社区论坛,与300万技术人员互动交流 >>进入 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: [php] view plaincopyclass Rectangle{ private $_wid
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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:
[php] view plaincopyclass 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
[php] view plaincopycd php-5.2.8/ext
./ext_skel --extname=class_ext
2,修改编译参数
[php] view plaincopycd php-5.2.8/ext/class_ext
vi 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:
[php] view plaincopydnl 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
[php] view plaincopycd php-5.2.8/ext/class_ext
vi php_class_ext.h
#在 PHP_FUNCTION(confirm_class_ext_compiled); 后面增加申明函数;
[php] view plaincopyPHP_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);
[php] view plaincopyvi class_ext.c
#申明方法的参数,注册到函数表中
[php] view plaincopyZEND_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[] */
};
[php] view plaincopy#其中ZEND_ACC_CTOR表示构造函数,ZEND_ACC_PUBLIC表示访问权限为PUBLIC.
[php] view plaincopy#接下来,在模块初始化函数中注册并初始化类
[php] view plaincopyzend_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;
}
[php] view plaincopy#在文件最后增加类的成员函数的具体实现代码
[php] view plaincopyPHP_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
width = 1; //如果_width为0,则赋默认值1
}
if( height
height = 1; //如果_height为0,则赋默认值1
}
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_width”), width TSRMLS_CC); //更新类成员变量_width的值
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_height”), height TSRMLS_CC); //更新类成员变量_height的值
RETURN_TRUE;
}
PHP_METHOD(Rectangle, clone)
{
zval *clone_obj;
zval *width,*height;
MAKE_STD_ZVAL(clone_obj);
object_init_ex(clone_obj, Rectangle_ce); //初始化对象,对象所属的类为Rectangle_ce
width = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_width”), 0 TSRMLS_CC); //获取类成员变量_width的值
height = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_height”), 0 TSRMLS_CC); //获取类成员变量_height的值
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_width”), width TSRMLS_CC); //更新Rectangle_ce类对象clone_obj的属性值_width
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL(“_height”), height TSRMLS_CC); //更新Rectangle_ce类对象clone_obj的属性值_height
RETURN_ZVAL(clone_obj, 1, 0); //返回该对象
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