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<?php $dateRange = ['2010-01-01', '2010-01-02', '2010-01-03']; $data = ['2010-01-01' => 5, '2010-01-03' => 7]; var_export( array_reduce( $dateRange, fn($result, $date) => $result + [$date => $data[$date] ?? null], [] ) );
Output for git.master_jit, git.master
array ( '2010-01-01' => 5, '2010-01-02' => NULL, '2010-01-03' => 7, )

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