${0} variable basics

From: Date: Sun, 24 Aug 2014 23:19:53 +0000
Subject: ${0} variable basics
Groups: php.general 
Request: Send a blank email to php-general+get-323788@lists.php.net to get a copy of this message
why ${0} is valid but ${0 is not valid? it means that curly braces evaluate what's inside them and that's why we cannot have ${0? variables shouldn't start from 0 so it means that it started from braces? if yes why I cannot have ${0? and what is the variable here finally? $0 is what it interprets? if yes so it is not a legal variable I am totally mixed up. Sincerely Negin Nickparsa

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