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run code in 150+ php & hhvm versions
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<?php echo json_encode(array("dog")); echo "<br><br>"; echo json_encode(array("dog","cat"));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
["dog"]<br><br>["dog","cat"]