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run code in 150+ php & hhvm versions
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<? $_SESSION["user"] = 'foo'; echo ('<p style="color:#808080;">Hello, <em>'.$_SESSION["user"].'</em>'); ?>
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<p style="color:#808080;">Hello, <em>foo</em>
Output for 4.3.0 - 5.3.29
<? $_SESSION["user"] = 'foo'; echo ('<p style="color:#808080;">Hello, <em>'.$_SESSION["user"].'</em>'); ?>