3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = "hello"; $b = "hi"; $val = "a"; echo $$val; // outputs "hello" echo "\n"; $val = "b"; echo $$val; // outputs "hi" echo "<br/>".$val;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
hello hi<br/>b