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<?php function isSequential(array $sequence, $diff = 1) { return $sequence[count($sequence) - 1] === $sequence[0] + ($diff * (count($sequence) - 1)); } $a = [5,7,8,9,10]; //not sequential $b = [2,3,4,5,6,7,8,9,10]; //sequential $c = [10]; //? $d = explode(',', '5,7,8,9,10'); //not sequential $data = [$a, $b, $c, $d]; foreach($data as $item){ if(isSequential($item)){ echo $item[0] . " Sequential series\n"; } else { echo $item[1] . " Non-Sequential series\n"; } }
Output for git.master, git.master_jit, rfc.property-hooks
7 Non-Sequential series 2 Sequential series 10 Sequential series 7 Non-Sequential series

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