PHP 手冊
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# Unsetting References

When you unset the reference, you just break the binding between variable name and variable content. This does not mean that variable content will be destroyed. For example:

`<?php $a = 1; $b =& $a; unset($a); ?>`

won't unset $b, just $a.

Again, it might be useful to think about this as analogous to Unix unlink call.

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