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run code in 200+ php & hhvm versions
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<?php $x = array("a"=>"Mighty","b"=>"Gravity","c"=>"Clock","d"=>"Strike"); foreach($x as $key => $q){ print_r($key.$q); print_r("\n");} ?>
based on 4Qo1a
Output for 4.3.0 - 7.2.0
aMighty bGravity cClock dStrike