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<?php $a = [ ['DATE' => '2012-11-28', 'totalCount' => null], ['DATE' => '2012-11-29', 'totalCount' => null], ['DATE' => '2012-11-30', 'totalCount' => null], ]; $b = [ 10 => ['DATE' => '2012-11-28', 'totalCount' => 30], 11 => ['DATE' => '2012-11-30', 'totalCount' => 40], 12 => ['DATE' => '2012-12-05', 'totalCount' => 50], ]; $map = array_column($b, null, 'DATE'); var_export( array_map( fn($row) => $map[$row['DATE']] ?? $row, $a ) );
Output for git.master, git.master_jit
array ( 0 => array ( 'DATE' => '2012-11-28', 'totalCount' => 30, ), 1 => array ( 'DATE' => '2012-11-29', 'totalCount' => NULL, ), 2 => array ( 'DATE' => '2012-11-30', 'totalCount' => 40, ), )

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