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run code in 200+ php & hhvm versions
Bugs & Features
<?php define('Ha', false); define('Ha', true); var_dump(hA);
Output for 7.2.0 - 7.2.6
Notice: Constant Ha already defined in /in/1UL1X on line 3 Warning: Use of undefined constant hA - assumed 'hA' (this will throw an Error in a future version of PHP) in /in/1UL1X on line 4 string(2) "hA"
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.1.20
Notice: Constant Ha already defined in /in/1UL1X on line 3 Notice: Use of undefined constant hA - assumed 'hA' in /in/1UL1X on line 4 string(2) "hA"
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/1UL1X on line 3 Notice: Use of undefined constant hA - assumed 'hA' in /in/1UL1X on line 4 string(2) "hA"