PHP 5.4's simplified string offset reading

user_281553 0
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As many of you already know, PHP 5.4 alpha has been released. I have a question regarding the following.

Simplified string offset reading. $str[1][0] is now a legal construct.

How exactly does $str[1][0] work?

EDIT: http://php.net/releases/NEWS_5_4_0_alpha1.txt

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