php扩展开发-面向对象

在zval变量里IS_OBJECT类型使用zend_object_value来保存变量的，我们看一下他的具体结果。

typedef struct _zend_object_value {
    zend_object_handle handle;
    const zend_object_handlers *handlers;
} zend_object_value;

在扩展中创建一个我们自己的类

zend_class_entry *myext_class_ce;//保存我们创建的对象实例

static zend_function_entry myext_class_method[] = {//函数的属性和方法都在这里定义
    {NULL, NULL, NULL}//固定语法
};

//在MINIT函数里
PHP_MINIT_FUNCTION(myext)
{
    zend_class_entry tmp_myext_class_ce;//临时变量
    INIT_CLASS_ENTRY(tmp_myext_class_ce,"myext_example_class",myext_class_method);//临时变量，类名称，类属性和方法
    myext_class_ce = zend_register_internal_class(&tmp_myext_class_ce TSRMLS_CC);//在内核中注册我们的类
}

/*

$class = new myext_example_class();

var_dump($class);

object(myext_example_class)#6 (0) {
  }

*/

创建类的第一个函数

ZEND_METHOD(myext_example_class,hello);

//ZEND_ME为方法注册，每个方法使用一个ZEND_ME
//参数说明
//1，类名称
//2，方法名称
//3，参数，跟普通函数的一样，也是ZEND_END_ARG_INFO
//4，修饰方法或属性，后面会专门讲到
static zend_function_entry myext_class_method[] = {
    ZEND_ME(myext_example_class,hello,NULL,ZEND_ACC_PUBLIC)
    {NULL, NULL, NULL}//固定语法
};

//函数定义，参数说明：
//类名称
//类方法名称
ZEND_METHOD(myext_example_class,hello){
    php_printf("hello");
}

创建一个构造函数__construct()

ZEND_METHOD(myext_example_class,__construct);

//创建构造方法同普通方法基本一样，唯一的差别在于第四个参数，ZEND_ACC_CTOR，表示它是构造方法
static zend_function_entry myext_class_method[] = {
    ZEND_ME(myext_example_class,hello,NULL,ZEND_ACC_PUBLIC)
    ZEND_ME(myext_example_class,__construct,NULL,ZEND_ACC_PUBLIC|ZEND_ACC_CTOR)
    {NULL, NULL, NULL}//固定语法
};

ZEND_METHOD(myext_example_class,__construct){
    php_printf("我是__construct函数");
}

现在来看一下修饰方法和属性的常量，通过他们可以定义方法的访问权限，是否是抽奖函数，是否是FINAL属性等等

下面详细的罗列出了所有常量，fn_flags代表可以在定义方法时使用，zend_property_info.flags代表可以在定义属性时使用，ce_flags代表在定义zend_class_entry时候可用。当需要用到多个常量的时候，我们可以采用或运算的形式，在定义构造函数的时候，我们已经遇到了,ZEND_ACC_PUBLIC|ZEND_ACC_CTOR

#define ZEND_ACC_STATIC                     0x01     /* fn_flags, zend_property_info.flags 静态方法或属性*/
#define ZEND_ACC_ABSTRACT                   0x02     /* fn_flags 抽象*/
#define ZEND_ACC_FINAL                      0x04     /* fn_flags 最终方法*/
#define ZEND_ACC_IMPLEMENTED_ABSTRACT       0x08     /* fn_flags 接口抽象方法*/
#define ZEND_ACC_IMPLICIT_ABSTRACT_CLASS    0x10     /* ce_flags */
#define ZEND_ACC_EXPLICIT_ABSTRACT_CLASS    0x20     /* ce_flags */
#define ZEND_ACC_FINAL_CLASS                0x40     /* ce_flags */
#define ZEND_ACC_INTERFACE                  0x80     /* ce_flags */
#define ZEND_ACC_INTERACTIVE                0x10     /* fn_flags */
#define ZEND_ACC_PUBLIC                     0x100    /* fn_flags, zend_property_info.flags */
#define ZEND_ACC_PROTECTED                  0x200    /* fn_flags, zend_property_info.flags */
#define ZEND_ACC_PRIVATE                    0x400    /* fn_flags, zend_property_info.flags */
#define ZEND_ACC_PPP_MASK   (ZEND_ACC_PUBLIC | ZEND_ACC_PROTECTED | ZEND_ACC_PRIVATE)
#define ZEND_ACC_CHANGED                    0x800    /* fn_flags, zend_property_info.flags */
#define ZEND_ACC_IMPLICIT_PUBLIC            0x1000   /* zend_property_info.flags; unused (1) */
#define ZEND_ACC_CTOR                       0x2000   /* fn_flags */
#define ZEND_ACC_DTOR                       0x4000   /* fn_flags */
#define ZEND_ACC_CLONE                      0x8000   /* fn_flags */
#define ZEND_ACC_ALLOW_STATIC               0x10000  /* fn_flags */
#define ZEND_ACC_SHADOW                     0x20000  /* fn_flags */
#define ZEND_ACC_DEPRECATED                 0x40000  /* fn_flags */
#define ZEND_ACC_CLOSURE                    0x100000 /* fn_flags */
#define ZEND_ACC_CALL_VIA_HANDLER           0x200000 /* fn_flags */

现在我们为这个类增加一些属性。添加属性变量需要在MINIT函数中实现，在类创建完成之后，我们就可以添加属性了

    zend_class_entry tmp_myext_class_ce;
    INIT_CLASS_ENTRY(tmp_myext_class_ce,"myext_example_class",myext_class_method);
    myext_class_ce = zend_register_internal_class(&tmp_myext_class_ce TSRMLS_CC);
//上面是创建类，下面是添加属性
//创建普通属性和静态属性的方法是一样，只需要在第四个参数中增加ZEND_ACC_STATIC即为静态属性
//创建类常量是另外一组的函数，和普通属性不一样
    zend_declare_property_null(myext_class_ce,"private_prop",sizeof("private_prop")-,ZEND_ACC_PRIVATE TSRMLS_CC);//私有权限，默认值为NULL
    zend_declare_property_string(myext_class_ce,"protected_prop",sizeof("protected_prop")-,"我是默认值",ZEND_ACC_PROTECTED TSRMLS_CC);//protected权限，默认值是"我是默认值"
    zend_declare_property_long(myext_class_ce,"public_prop",sizeof("public_prop")-,,ZEND_ACC_PUBLIC TSRMLS_CC);//public，默认值是100
    zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-,"我是静态变量",ZEND_ACC_PUBLIC|ZEND_ACC_STATIC TSRMLS_CC);//静态变量,默认值是"我是静态变量"
    zend_declare_class_constant_string(myext_class_ce,"CONSTANT_PROP",sizeof("CONSTANT_PROP") - ,"我是类常量" TSRMLS_CC);//类常量，默认值是"我是类常量"
/*

$class = new myext_example_class();
var_dump($class);
$class->hello();
var_dump(myext_example_class::$static_prop);
var_dump(myext_example_class::CONSTANT_PROP);

object(myext_example_class)#6 (3) {
["private_prop":"myext_example_class":private]=>
NULL
["protected_prop":protected]=>
string(15) "我是默认值"
["public_prop"]=>
int(100)
}
hello

string(18) "我是静态变量"
string(15) "我是类常量"

*/

在php内核中，由于操作变量的类型不同，通常同样一个功能，会有一组函数，上面我们提到的创建类属性和类常量也是有一组操作。

//以下操作都是在zend_API.h
//定义类属性
ZEND_API int zend_declare_property(zend_class_entry *ce, const char *name, int name_length, zval *property, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_ex(zend_class_entry *ce, const char *name, int name_length, zval *property, int access_type, const char *doc_comment, int doc_comment_len TSRMLS_DC);
ZEND_API int zend_declare_property_null(zend_class_entry *ce, const char *name, int name_length, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_bool(zend_class_entry *ce, const char *name, int name_length, long value, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_long(zend_class_entry *ce, const char *name, int name_length, long value, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_double(zend_class_entry *ce, const char *name, int name_length, double value, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_string(zend_class_entry *ce, const char *name, int name_length, const char *value, int access_type TSRMLS_DC);
ZEND_API int zend_declare_property_stringl(zend_class_entry *ce, const char *name, int name_length, const char *value, int value_len, int access_type TSRMLS_DC);

//定义类常量
ZEND_API int zend_declare_class_constant(zend_class_entry *ce, const char *name, size_t name_length, zval *value TSRMLS_DC);
ZEND_API int zend_declare_class_constant_null(zend_class_entry *ce, const char *name, size_t name_length TSRMLS_DC);
ZEND_API int zend_declare_class_constant_long(zend_class_entry *ce, const char *name, size_t name_length, long value TSRMLS_DC);
ZEND_API int zend_declare_class_constant_bool(zend_class_entry *ce, const char *name, size_t name_length, zend_bool value TSRMLS_DC);
ZEND_API int zend_declare_class_constant_double(zend_class_entry *ce, const char *name, size_t name_length, double value TSRMLS_DC);
ZEND_API int zend_declare_class_constant_stringl(zend_class_entry *ce, const char *name, size_t name_length, const char *value, size_t value_length TSRMLS_DC);
ZEND_API int zend_declare_class_constant_string(zend_class_entry *ce, const char *name, size_t name_length, const char *value TSRMLS_DC);

接下来，我们来看一下，接口的实现，以及接口和类的继承

定义一个接口，这个过程与定义类类似

zend_class_entry *myext_interface_ce;

static zend_function_entry myext_interface_method[] = {
    ZEND_ABSTRACT_ME(myext_interface_ce,int_func,NULL)//定义一个抽奖方法，这个方法可以不实现，也就是不需要存在一个ZEND_ME(myext_interface_ce,int_func)
    {NULL, NULL, NULL}//固定语法
};

    zend_class_entry tmp_myext_interface_ce;
    INIT_CLASS_ENTRY(tmp_myext_interface_ce,"myext_example_interface",myext_interface_method);
    myext_interface_ce = zend_register_internal_interface(&tmp_myext_interface_ce TSRMLS_CC);//注册接口的函数与注册类的不一样

/*

class interface_class implements myext_example_interface{
public function int_func(){
echo "我继承了接口\n";
}
}

$interface_class = new interface_class();
$interface_class->int_func();

我继承了接口

*/

我们在扩展的代码里实现继承，让myext_example_class继承myext_example_interface

ZEND_METHOD(myext_example_class,int_func);//php_myext.h

//抽象函数int_func的实现
ZEND_METHOD(myext_example_class,int_func){
php_printf("我是class继承了接口interface");
}

static zend_function_entry myext_class_method[] = {
    ZEND_ME(myext_example_class,hello,NULL,ZEND_ACC_PUBLIC)
    ZEND_ME(myext_example_class,__construct,NULL,ZEND_ACC_PUBLIC|ZEND_ACC_CTOR)
    ZEND_ME(myext_example_class,int_func,NULL,ZEND_ACC_PUBLIC)
    {NULL, NULL, NULL}//固定语法
};

    zend_class_entry tmp_myext_interface_ce;
    INIT_CLASS_ENTRY(tmp_myext_interface_ce,"myext_example_interface",myext_interface_method);
    myext_interface_ce = zend_register_internal_interface(&tmp_myext_interface_ce TSRMLS_CC);

    zend_class_entry tmp_myext_class_ce;
    INIT_CLASS_ENTRY(tmp_myext_class_ce,"myext_example_class",myext_class_method);
    myext_class_ce = zend_register_internal_class(&tmp_myext_class_ce TSRMLS_CC);
    zend_declare_property_null(myext_class_ce,"private_prop",sizeof("private_prop")-,ZEND_ACC_PRIVATE TSRMLS_CC);
    zend_declare_property_string(myext_class_ce,"protected_prop",sizeof("protected_prop")-,"我是默认值",ZEND_ACC_PROTECTED TSRMLS_CC);
    zend_declare_property_long(myext_class_ce,"public_prop",sizeof("public_prop")-,,ZEND_ACC_PUBLIC TSRMLS_CC);
    zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-,"我是静态变量",ZEND_ACC_PUBLIC|ZEND_ACC_STATIC TSRMLS_CC);
    zend_declare_class_constant_string(myext_class_ce,"CONSTANT_PROP",sizeof("CONSTANT_PROP") - ,"我是类常量" TSRMLS_CC);
    zend_class_implements(myext_class_ce TSRMLS_CC,,myext_interface_ce);//这句话表示myext_class_ce继承接口myext_interface_ce

/*

$class = new myext_example_class();

$class->int_func();

我是class继承了接口interface

*/

我们再来实现一个类继承的例子

ZEND_METHOD(myext_example_class,class_func);//php_myext.h
ZEND_METHOD(myext_example_parent_class,class_func);//php_myext.h

zend_class_entry *myext_parent_class_ce;//保存父类的变量

static zend_function_entry myext_parent_class_method[] = {
    ZEND_ME(myext_example_parent_class,class_func,NULL,ZEND_ACC_PUBLIC)
    {NULL, NULL, NULL}//固定语法
};

    zend_class_entry tmp_myext_parent_class_ce;
    INIT_CLASS_ENTRY(tmp_myext_parent_class_ce,"myext_example_parent_class",myext_parent_class_method);
    myext_parent_class_ce = zend_register_internal_class(&tmp_myext_parent_class_ce TSRMLS_CC);//注册一个myext_example_parent_class

    zend_class_entry tmp_myext_class_ce;
    INIT_CLASS_ENTRY(tmp_myext_class_ce,"myext_example_class",myext_class_method);
    //myext_class_ce = zend_register_internal_class(&tmp_myext_class_ce TSRMLS_CC);//正常注册类
    myext_class_ce = zend_register_internal_class_ex(&tmp_myext_class_ce,myext_parent_class_ce,"myext_example_parent_class" TSRMLS_CC);//继承注册类，第一个参数是一样的，第二个是继承父类的变量，第三个是父类的名称
    zend_declare_property_null(myext_class_ce,"private_prop",sizeof("private_prop")-,ZEND_ACC_PRIVATE TSRMLS_CC);
    zend_declare_property_string(myext_class_ce,"protected_prop",sizeof("protected_prop")-,"我是默认值",ZEND_ACC_PROTECTED TSRMLS_CC);
    zend_declare_property_long(myext_class_ce,"public_prop",sizeof("public_prop")-,,ZEND_ACC_PUBLIC TSRMLS_CC);
    zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-,"我是静态变量",ZEND_ACC_PUBLIC|ZEND_ACC_STATIC TSRMLS_CC);
    zend_declare_class_constant_string(myext_class_ce,"CONSTANT_PROP",sizeof("CONSTANT_PROP") - ,"我是类常量" TSRMLS_CC);
    zend_class_implements(myext_class_ce TSRMLS_CC,,myext_interface_ce);

ZEND_METHOD(myext_example_parent_class,class_func){
    php_printf("我是父类的class_func\n");
}

ZEND_METHOD(myext_example_class,class_func){
    php_printf("我是子类的class_func\n");
}

/*

$parent_class = new myext_example_parent_class();
$parent_class->class_func();
$class = new myext_example_class();
$class->class_func();

我是父类的class_func
我是__construct函数
我是子类的class_func

*/              

接着我们来看一下怎么样在类方法中使用类的属性变量

ZEND_METHOD(myext_example_class,read_property){
zval *private_prop,*protected_prop,$public_prop;
zval *static_prop;
zend_class_entry *ce;

ce = Z_OBJCE_P(getThis());

private_prop = zend_read_property(myext_class_ce,getThis(),"private_prop",sizeof("private_prop") - , TSRMLS_CC);//获取private_prop的属性值，相当于php的$this->private_prop
php_var_dump(&private_prop, TSRMLS_CC);
protected_prop = zend_read_property(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - , TSRMLS_CC);
php_var_dump(&protected_prop, TSRMLS_CC);

static_prop = zend_read_static_property(ce,"static_prop",sizeof("static_prop") - , TSRMLS_CC);//获取静态属性static_prop的属性值，相当于php的self::$static_prop
php_var_dump(&static_prop, TSRMLS_CC);

zend_update_property_string(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - ,"更新protected_prop的值" TSRMLS_CC);//设置protected_prop的属性值，相当于php的$this->protected_prop = "更新protected_prop";
protected_prop = zend_read_property(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - , TSRMLS_CC);
php_var_dump(&protected_prop, TSRMLS_CC);

zend_update_static_property_string(myext_class_ce,"static_prop",sizeof("static_prop") - ,"更新static_prop的值" TSRMLS_CC);//设置静态属性static_prop的属性值，相当于php的self::$static_prop = "更新static_prop的值";

static_prop = zend_read_static_property(ce,"static_prop",sizeof("static_prop") - , TSRMLS_CC); 

php_var_dump(&static_prop, TSRMLS_CC); }

//zend_update_property*的一组函数

ZEND_API void zend_update_property(zend_class_entry *scope, zval *object, const char *name, int name_length, zval *value TSRMLS_DC);
ZEND_API void zend_update_property_null(zend_class_entry *scope, zval *object, const char *name, int name_length TSRMLS_DC);
ZEND_API void zend_update_property_bool(zend_class_entry *scope, zval *object, const char *name, int name_length, long value TSRMLS_DC);
ZEND_API void zend_update_property_long(zend_class_entry *scope, zval *object, const char *name, int name_length, long value TSRMLS_DC);
ZEND_API void zend_update_property_double(zend_class_entry *scope, zval *object, const char *name, int name_length, double value TSRMLS_DC);
ZEND_API void zend_update_property_string(zend_class_entry *scope, zval *object, const char *name, int name_length, const char *value TSRMLS_DC);
ZEND_API void zend_update_property_stringl(zend_class_entry *scope, zval *object, const char *name, int name_length, const char *value, int value_length TSRMLS_DC);

//zend_update_static_property*的一组函数

ZEND_API int zend_update_static_property_null(zend_class_entry *scope, const char *name, int name_length TSRMLS_DC); 
ZEND_API int zend_update_static_property_bool(zend_class_entry *scope, const char *name, int name_length, long value TSRMLS_DC); 
ZEND_API int zend_update_static_property_long(zend_class_entry *scope, const char *name, int name_length, long value TSRMLS_DC); 
ZEND_API int zend_update_static_property_double(zend_class_entry *scope, const char *name, int name_length, double value TSRMLS_DC); 
ZEND_API int zend_update_static_property_string(zend_class_entry *scope, const char *name, int name_length, const char *value TSRMLS_DC); 
ZEND_API int zend_update_static_property_stringl(zend_class_entry *scope, const char *name, int name_length, const char *value, int value_length TSRMLS_DC);
ZEND_API int zend_update_static_property(zend_class_entry *scope, const char *name, int name_length, zval *value TSRMLS_DC);