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Home > Backend Development > PHP Tutorial > 内存管理 - PHP脚本运行的时候,那些变量被放到了栈内存,那些被保存到了堆内存?

内存管理 - PHP脚本运行的时候,那些变量被放到了栈内存,那些被保存到了堆内存?

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Release： 2016-06-06 20:27:26
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PHP脚本运行的时候,那些变量被放到了栈内存,那些被保存到了堆内存?

回复内容：

PHP脚本运行的时候,那些变量被放到了栈内存,那些被保存到了堆内存?

使用堆还是栈来存储数据是由PHP引擎决定的,PHP开发者不需要关心.

转:
在PHP5的Zend Engine的实现中,所有的值都是在堆上分配空间,并且通过引用计数和垃圾收集来管理.
PHP5的Zend Engine主要使用指向zval结构的指针来操作值,在很多地方甚至通过zval的二级指针来操作.
而在PHP7的Zend Engine实现中,值是通过zval结构本身来操作(非指针).
新的zval结构直接被存放在VM的栈上,HashTable的桶里,以及属性槽里.
这样大大减少了在堆上分配和释放内存的操作,还避免了对简单值的引用计数和垃圾收集.

Related labels：
php Memory memory allocation memory leak Memory management
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