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run code in 200+ php & hhvm versions
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<?php $GLOBALS += ['foo' => 'bar', '' => 'foo']; echo $${''};
based on jAtH0
Output for 5.4.10 - 5.6.28, 7.0.5 - 7.2.0
bar
Output for 7.0.0 - 7.0.4
Notice: Undefined variable: in /in/qYu7K on line 4 Notice: Undefined variable: in /in/qYu7K on line 4
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/qYu7K on line 3
Process exited with code 255.