<?php $array = [ 'Sum_1' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 775.00], ['e' => 26, 'u' => 'Test2', 'a' => 555.00], ], 'Sum_2' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 110.00], ], 'Sum_3' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 444.00], ], ]; $result = []; foreach ($array as $k => $rows) { foreach ($rows as ['a' => $a]) { $result[$k] = ($result[$k] ?? 0) + $a; } } var_export($result);
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