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")-1,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")-1,"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")-1,100,ZEND_ACC_PUBLIC TSRMLS_CC);//public，默认值是100 zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-1,"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") - 1,"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")-1,ZEND_ACC_PRIVATE TSRMLS_CC); zend_declare_property_string(myext_class_ce,"protected_prop",sizeof("protected_prop")-1,"我是默认值",ZEND_ACC_PROTECTED TSRMLS_CC); zend_declare_property_long(myext_class_ce,"public_prop",sizeof("public_prop")-1,100,ZEND_ACC_PUBLIC TSRMLS_CC); zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-1,"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") - 1,"我是类常量" TSRMLS_CC); zend_class_implements(myext_class_ce TSRMLS_CC,1,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")-1,ZEND_ACC_PRIVATE TSRMLS_CC); zend_declare_property_string(myext_class_ce,"protected_prop",sizeof("protected_prop")-1,"我是默认值",ZEND_ACC_PROTECTED TSRMLS_CC); zend_declare_property_long(myext_class_ce,"public_prop",sizeof("public_prop")-1,100,ZEND_ACC_PUBLIC TSRMLS_CC); zend_declare_property_string(myext_class_ce,"static_prop",sizeof("static_prop")-1,"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") - 1,"我是类常量" TSRMLS_CC); zend_class_implements(myext_class_ce TSRMLS_CC,1,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") - 1,0 TSRMLS_CC);//获取private_prop的属性值，相当于php的$this->private_prop php_var_dump(&private_prop,1 TSRMLS_CC); protected_prop = zend_read_property(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - 1,0 TSRMLS_CC); php_var_dump(&protected_prop,1 TSRMLS_CC); static_prop = zend_read_static_property(ce,"static_prop",sizeof("static_prop") - 1,0 TSRMLS_CC);//获取静态属性static_prop的属性值，相当于php的self::$static_prop php_var_dump(&static_prop,1 TSRMLS_CC); zend_update_property_string(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - 1,"更新protected_prop的值" TSRMLS_CC);//设置protected_prop的属性值，相当于php的$this->protected_prop = "更新protected_prop"; protected_prop = zend_read_property(myext_class_ce,getThis(),"protected_prop",sizeof("protected_prop") - 1,0 TSRMLS_CC); php_var_dump(&protected_prop,1 TSRMLS_CC); zend_update_static_property_string(myext_class_ce,"static_prop",sizeof("static_prop") - 1,"更新static_prop的值" TSRMLS_CC);//设置静态属性static_prop的属性值，相当于php的self::$static_prop = "更新static_prop的值";
static_prop = zend_read_static_property(ce,"static_prop",sizeof("static_prop") - 1,0 TSRMLS_CC);
php_var_dump(&static_prop,1 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);
