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run code in 150+ php & hhvm versions
Bugs & Features
<?php $i = 1; $array[$i] = $i++; var_dump($array);
Output for 5.1.0 - 7.1.0
array(1) { [2]=> int(1) }
Output for 4.3.0 - 5.0.5
array(1) { [1]=> int(1) }