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<?php $array = range(1, 3); $result = []; foreach ($array as $shifter => $unused) { foreach ($array as $index => $value) { $key = $shifter + $index; $result[$key] = ($result[$key] ?? 0) + $value; } } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 1, 1 => 3, 2 => 6, 3 => 5, 4 => 3, )

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