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run code in 150+ php & hhvm versions
Bugs & Features
<?php $attempts = array(); $localTaskId = 3; $x =& $attempts[$localTaskId]; isset ($x) ? (++ $x) : ($x = 1); echo $attempts[$localTaskId]."\n"; isset ($x) ? (++ $x) : ($x = 1); echo $attempts[$localTaskId]."\n";
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1 2
Output for hhvm-3.10.0

Process exited with code 153.