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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 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
7 Non-Sequential series 2 Sequential series 10 Sequential series 7 Non-Sequential series
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/9Hcn8 on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/9Hcn8 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/9Hcn8 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/9Hcn8 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/9Hcn8 on line 2
Process exited with code 255.
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