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<?php $arr = [ ["partner_name" => "Liquid Education", "lead_payIn" => 44.00], ["partner_name" => "Yodel Voice", "lead_payIn" => 44.00], ["partner_name" => "Yodel Voice", "lead_payIn" => 44.00], ["partner_name" => "Yodel Voice", "lead_payIn" => 44.00], ["partner_name" => "Yodel Voice", "lead_payIn" => 44.00], ]; $result = []; foreach ($arr as $a) { array_key_exists( $a["partner_name"], $result ) ? $result[$a["partner_name"]] += $a["lead_payIn"] : $result[$a["partner_name"]] = $a["lead_payIn"]; } print_r($result);