Php/docs/internals2.counter.examples.objective
对象化接口
对象接口提供一个面向对象的方式来访问扩展接口。下面的例子显示了使用对象化接口实现上面的例子。此例子的输出,除了所显示“计数器无效!”变为由 PHP 发出的变量 $counter_three
不是对象的警告信息以外,其他完全一样。此例子展示了定义在扩展中定义的 Counter
的子类,并对实例变量而不是用方法存取计数器的值。
Example #1 "counter" 的对象化接口
<?phpclass MyCounter extends Counter{ public function printCounterInfo() { printf("计数器的名称为 '%s',且%s进行持久化。其当前值为 %d.\n", $this->getMeta(COUNTER_META_NAME), $this->getMeta(COUNTER_META_IS_PERSISTENT) ? : '不', $this->value); }}Counter::setCounterClass("MyCounter");if (($counter_one = Counter::getNamed("one")) === NULL) { $counter_one = new Counter("one", 0, COUNTER_FLAG_PERSIST);}$counter_one->bumpValue(2); // 不允许直接 "set" 值$counter_two = new Counter("two", 5);$counter_three = Counter::getNamed("three");$counter_four = new Counter("four", 2, COUNTER_FLAG_PERSIST | COUNTER_FLAG_SAVE | COUNTER_FLAG_NO_OVERWRITE);$counter_four->bumpValue(1);$counter_one->printCounterInfo();$counter_two->printCounterInfo();$counter_three->printCounterInfo();$counter_four->printCounterInfo();?>