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run code in 150+ php & hhvm versions
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<?php ${"rose"} = "white"; $rose = "red"; print_r(${"rose"}); echo "\n"; $arr{" "} = 99; var_dump($arr);
based on pAtXb
Output for 4.3.0 - 7.1.0
red array(1) { [" "]=> int(99) }