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<?php $list = [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20]; for($i = 0;$i<count($list);$i++){ echo current($list)+1 . '<br>'; if(next($list)==current($list)+1){ echo $list[$i]; } else { echo 'no'.PHP_EOL; } } print_r($list);
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