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<?php $values = [1, 2, 3, 4, 5, 6]; $result = 0; reset($values); while (key($values) !== null) { $result += current($values) - next($values); next($values); } var_dump($result); var_dump(array_sum(array_column(array_chunk($values, 2), 0)) - array_sum(array_column(array_chunk($values, 2), 1))); var_dump( array_reduce(array_chunk($values, 2), function ($result, $item) { return $result + current($item) - next($item); }));
Output for git.master, git.master_jit, rfc.property-hooks
int(-3) int(-3) int(-3)

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