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run code in 150+ php & hhvm versions
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<?php $names = array('Anderson','Beresford','Donovan','Emerson','Graham'); $alphabet = array(); $previous_letter = ''; foreach($names as $value) { if($value[0] != $previous_letter) { $alphabet[] = $previous_letter = $value[0]; } } zz ?>
based on fAWPN
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant zz - assumed 'zz' in /in/E1Uja on line 15
Output for 4.3.0 - 5.6.28
Notice: Use of undefined constant zz - assumed 'zz' in /in/E1Uja on line 16