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Subject: Undefined Constants behavior in PHP6
From: 131.php@cloudyks.org ("news.php.net")

I was wondering if someone already think about modifying the actual behavior 
of undefined constants in php6.
I'm desperate with some

if(DEBUG) print_r($_SESSION);

- and lot others case -

Is there a possibility undefined constants ( strings ) return "null" :x ?
I do not think it's a mistake, since echo "{$array[foo]}" is not good and 
"{$array['foo']}" is

131