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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 = $value[0]; } } print_r($alphabets); ?>
based on E1Uja
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: alphabets in /in/e063X on line 15
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: alphabets in /in/e063X on line 15