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=2.1 zval 写时复制 分离demo fix #33

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xiaoerli520
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hello
在2.1 zval 章节中,您的写时复制的分离情况似乎有错误

PHP7 中,通过& 引用 标志赋值的,不会发生分离,而没有&引用的,指定type会发生写时复制,并且与原变量分离,pull request已经提交 :)

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