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<?php $array = [ [ ["2011-11-18 00:00:00" => 'C'], ["2011-11-18 00:00:00" => 'I'], ["2011-11-18 00:00:00" => 'S'], ], [ ["2011-11-22 00:00:00" => 'C'], ["2011-11-22 00:00:00" => 'S'] ] ]; $result = []; foreach ($array as $set) { foreach ($set as $row) { foreach ($row as $k => $_) { $result[$k] = ($result[$k] ?? 0) + 1; } } } var_export($result);
Output for git.master_jit, git.master
array ( '2011-11-18 00:00:00' => 3, '2011-11-22 00:00:00' => 2, )

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