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run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = ['bar']; print_r(['foo' => $foo]); print_r(compact('foo'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.1
Array ( [foo] => Array ( [0] => bar ) ) Array ( [foo] => Array ( [0] => bar ) )