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
ZEND_API zval *zend_read_property(zend_class_entry *scope, zval *object, char *name, int name_length, zend_bool silent TSRMLS_DC); 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,用具体的对象无关。
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:
ZEND_API void zend_update_property(zend_class_entry *scope, zval *object, char *name, int name_length, zval *value TSRMLS_DC); 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:
class baby { public $age; public static $area; public function __construct($age, $area) { $this->age = $age; self::$area = $area; var_dump($this->age, self::$area); } } ZEND_METHOD(baby, __construct) { zval *age, *area; zend_class_entry *ce; ce = Z_OBJCE_P(getThis()); if( zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "zz", &age, &area) == FAILURE ) { printf("Errorn"); RETURN_NULL(); } zend_update_property(ce, getThis(), "age", sizeof("age")-1, age TSRMLS_CC); zend_update_static_property(ce, "area", sizeof("area")-1, area TSRMLS_CC); age = NULL; area = NULL; age = zend_read_property(ce, getThis(), "age", sizeof("age")-1, 0 TSRMLS_DC); php_var_dump(&age, 1 TSRMLS_CC); area = zend_read_static_property(ce, "area", sizeof("area")-1, 0 TSRMLS_DC); php_var_dump(&area, 1 TSRMLS_CC); }
一些其它的快捷函数
ZEND_API void zend_update_property_null(zend_class_entry *scope, zval *object, char *name, int name_length TSRMLS_DC); ZEND_API void zend_update_property_bool(zend_class_entry *scope, zval *object, char *name, int name_length, long value TSRMLS_DC); ZEND_API void zend_update_property_long(zend_class_entry *scope, zval *object, char *name, int name_length, long value TSRMLS_DC); ZEND_API void zend_update_property_double(zend_class_entry *scope, zval *object, char *name, int name_length, double value TSRMLS_DC); ZEND_API void zend_update_property_string(zend_class_entry *scope, zval *object, char *name, int name_length, const char *value TSRMLS_DC); 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); ZEND_API int zend_update_static_property_null(zend_class_entry *scope, char *name, int name_length TSRMLS_DC); ZEND_API int zend_update_static_property_bool(zend_class_entry *scope, char *name, int name_length, long value TSRMLS_DC); ZEND_API int zend_update_static_property_long(zend_class_entry *scope, char *name, int name_length, long value TSRMLS_DC); ZEND_API int zend_update_static_property_double(zend_class_entry *scope, char *name, int name_length, double value TSRMLS_DC); ZEND_API int zend_update_static_property_string(zend_class_entry *scope, char *name, int name_length, const char *value TSRMLS_DC); 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);
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