3v4l.org

run code in 150+ php & hhvm versions
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<?php $xyz[]="a"; var_dump($xyz);
based on OMV9r
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(1) "a" }