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<?php $mainNumber = 6; $finalData = []; for ($i = 1; $i <= $mainNumber; ++$i) { $finalData[] = $mainNumber + (($i & 1 ? -1 : 1) * $i); } var_export($finalData);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 5, 1 => 8, 2 => 3, 3 => 10, 4 => 1, 5 => 12, )

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