<?php $array = [ [ ['2011-11-18 00:00:00' => 'C'], ['2011-11-18 00:00:00' => 'I'], ['2011-11-18 00:00:00' => 'S'] ], [ ['2011-11-22 00:00:00' => 'C'], ['2011-11-22 00:00:00' => 'S'] ] ]; var_export(array_count_values(array_map(key(...), array_merge(...$array))));
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