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run code in 150+ php & hhvm versions
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<?php $a = 'a'; $foo = 'woot'; $$a = 'foo'; $$$a = 'bar'; echo $a . "\n"; echo $foo . "\n"; echo $$a . "\n"; echo $woot . "\n";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
foo woot woot bar