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run code in 150+ php & hhvm versions
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<?php $a = array(0=>'a',1=>'b',2=>'c',3=>'d'); while(list($k, $v) = each($a)){ echo $k.'<br/>'; echo $v.'<br/>'; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
0<br/>a<br/>1<br/>b<br/>2<br/>c<br/>3<br/>d<br/>