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run code in 150+ php & hhvm versions
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<?php $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43"); foreach($age as $x=>$x_value) { echo "Key=" . $x . ", Value=" . $x_value; echo "<br>"; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Key=Peter, Value=35<br>Key=Ben, Value=37<br>Key=Joe, Value=43<br>
Output for hhvm-3.10.0

Process exited with code 153.