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<?php $asdf = array("a"=>"aaa", "b"=>"bbb"); echo "<pre>"; print_r($asdf); echo "</pre>"; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<pre>Array ( [a] => aaa [b] => bbb ) </pre>