<?php $array = [ 'Sum_1' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 775.00], ['e' => 26, 'u' => 'Test2', 'a' => 555.00], ], 'Sum_2' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 110.00], ], 'Sum_3' => [ ['e' => 1000001, 'u' => 'Test1', 'a' => 444.00], ], ]; var_export( array_map( fn($rows) => array_sum( array_column($rows, 'a') ), $array ) );
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