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                PHP 5.3 版本之前都是采用引用計數的方式管理內存,PHP 所有的變量存在一個叫 zval 的變量容器中,當變量被引用的時候,引用計數會 + 1,變量引用計數變為 0 時,PHP 將在內存中銷毀這個變量。 但是引用計數中的循環引用,引用計數不會消減為 0,就會導致內存泄露。
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