11.2 PHP中的面向对象(二)

在上一节里我们已经看了下如何操作一个对象的方法,这一节主要描述与对象属性有关的东西。有关如何对它进行定义的操作我们已经在上一章中描述过了,这里不再叙述,只讲对其的操作。

读取对象的属性

  1. ZEND_API zval *zend_read_property(zend_class_entry *scope, zval *object, char *name, int name_length, zend_bool silent TSRMLS_DC);
  2. ZEND_API zval *zend_read_static_property(zend_class_entry *scope, char *name, int name_length, zend_bool silent TSRMLS_DC);

zend_read_property函数用于读取对象的属性,而zend_read_static_property则用于读取静态属性。可以看出,静态属性是直接保存在类上的,与具体的对象无关。silent参数:

  • 0: 如果属性不存在,则抛出一个notice错误。
  • 1: 如果属性不存在,不报错。
如果所查的属性不存在,那么此函数将返回IS_NULL类型的zval。

更新对象的属性

  1. ZEND_API void zend_update_property(zend_class_entry *scope, zval *object, char *name, int name_length, zval *value TSRMLS_DC);
  2. ZEND_API int zend_update_static_property(zend_class_entry *scope, char *name, int name_length, zval *value TSRMLS_DC);

zend_update_property用来更新对象的属性,zend_update_static_property用来更新类的静态属性。如果对象或者类中没有相关的属性,函数将自动的添加上。

读写对象与类属性的实例

假设我们已经在扩展中定义好下面的类:

  1. class baby
  2. {
  3. public $age;
  4. public static $area;
  5. public function __construct($age, $area)
  6. {
  7. $this->age = $age;
  8. self::$area = $area;
  9. var_dump($this->age, self::$area);
  10. }
  11. }
  12. ZEND_METHOD(baby, __construct)
  13. {
  14. zval *age, *area;
  15. zend_class_entry *ce;
  16. ce = Z_OBJCE_P(getThis());
  17. if( zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "zz", &age, &area) == FAILURE )
  18. {
  19. printf("Error\n");
  20. RETURN_NULL();
  21. }
  22. zend_update_property(ce, getThis(), "age", sizeof("age")-1, age TSRMLS_CC);
  23. zend_update_static_property(ce, "area", sizeof("area")-1, area TSRMLS_CC);
  24. age = NULL;
  25. area = NULL;
  26. age = zend_read_property(ce, getThis(), "age", sizeof("age")-1, 0 TSRMLS_DC);
  27. php_var_dump(&age, 1 TSRMLS_CC);
  28. area = zend_read_static_property(ce, "area", sizeof("area")-1, 0 TSRMLS_DC);
  29. php_var_dump(&area, 1 TSRMLS_CC);
  30. }
  31. //为类添加age 和 area属性
  32. PHP_MINIT_FUNCTION(say_hello)
  33. {
  34. zend_class_entry ce;
  35. INIT_CLASS_ENTRY(ce,"baby",myclass_method);
  36. baby_ce = zend_register_internal_class(&ce TSRMLS_CC);
  37. zend_declare_property_null(baby_ce, "age", strlen("age"), ZEND_ACC_PUBLIC TSRMLS_CC);
  38. zend_declare_property_null(baby_ce, "area", strlen("area"), ZEND_ACC_STATIC|ZEND_ACC_PUBLIC TSRMLS_CC);
  39. return SUCCESS;
  40. }

感谢 @看你取的破名 发现的错误。

一些其它的快捷函数

更新对象与类的属性

  1. ZEND_API void zend_update_property_null(zend_class_entry *scope, zval *object, char *name, int name_length TSRMLS_DC);
  2. ZEND_API void zend_update_property_bool(zend_class_entry *scope, zval *object, char *name, int name_length, long value TSRMLS_DC);
  3. ZEND_API void zend_update_property_long(zend_class_entry *scope, zval *object, char *name, int name_length, long value TSRMLS_DC);
  4. ZEND_API void zend_update_property_double(zend_class_entry *scope, zval *object, char *name, int name_length, double value TSRMLS_DC);
  5. ZEND_API void zend_update_property_string(zend_class_entry *scope, zval *object, char *name, int name_length, const char *value TSRMLS_DC);
  6. ZEND_API void zend_update_property_stringl(zend_class_entry *scope, zval *object, char *name, int name_length, const char *value, int value_length TSRMLS_DC);
  7. ZEND_API int zend_update_static_property_null(zend_class_entry *scope, char *name, int name_length TSRMLS_DC);
  8. ZEND_API int zend_update_static_property_bool(zend_class_entry *scope, char *name, int name_length, long value TSRMLS_DC);
  9. ZEND_API int zend_update_static_property_long(zend_class_entry *scope, char *name, int name_length, long value TSRMLS_DC);
  10. ZEND_API int zend_update_static_property_double(zend_class_entry *scope, char *name, int name_length, double value TSRMLS_DC);
  11. ZEND_API int zend_update_static_property_string(zend_class_entry *scope, char *name, int name_length, const char *value TSRMLS_DC);
  12. ZEND_API int zend_update_static_property_stringl(zend_class_entry *scope, char *name, int name_length, const char *value, int value_length TSRMLS_DC);