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<?php $array = [ ['_id' => '5f76b1788ee23077dccd1a2c', 'product' => ['_id'=>'5d0391a4a72ffe76b8fcc610'], 'count'=> 1], ['_id' => '5f76b6288ee2300700cd1a3a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1], ['_id' => '5f76d2488ee23083d3cd1a4a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1] ]; $productCounts = []; foreach ($array as $item) { $productId = $item['product']['_id']; $productCounts[$productId] = ($productCounts[$productId] ?? 0) + $item['count']; } var_export($productCounts);
Output for git.master, git.master_jit, rfc.property-hooks
array ( '5d0391a4a72ffe76b8fcc610' => 1, '5d0391b6a72ffe76b8fcc611' => 2, )

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