php二维数组实现多条件合并数据

//如果code相同，当存在state=0和state=1同时存在或者state=0时取时间最小的数据，当state=1时取最新的时间数据,得到的数据合并成一个新数组
public function tests(){
        $array = [
            ['code' => 'HA001', 'state' => 0, 'time' => '2023-01-09 12:00:00'],
            ['code' => 'HA001', 'state' => 0, 'time' => '2023-01-02 12:00:00'],
            ['code' => 'HA001', 'state' => 1, 'time' => '2023-01-03 12:00:00'],
            ['code' => 'HA002', 'state' => 1, 'time' => '2023-01-04 12:00:00'],
            ['code' => 'HA002', 'state' => 1, 'time' => '2023-01-01 10:00:00'],
            ['code' => 'HA003', 'state' => 1, 'time' => '2023-01-04 12:00:00'],
            ['code' => 'HA003', 'state' => 1, 'time' => '2023-01-06 12:00:00'],
            ['code' => 'HA004', 'state' => 0, 'time' => '2023-01-03 10:00:00'],
            ['code' => 'HA004', 'state' => 1, 'time' => '2023-01-01 10:00:00'],
            ['code' => 'HA004', 'state' => 0, 'time' => '2023-01-07 10:00:00']
        ];
        $result = [];
        foreach ($array as $item) {
            $code = $item['code'];
            if (!isset($result[$code])) {
                $result[$code] = $item;
            } else {
                // 如果当前code已存在，则根据state和time进行判断
                if ($result[$code]['state'] === 0 && $item['state'] === 0) {
                    // 如果两个都是state=0，取time更小的
                    if (strtotime($item['time']) < strtotime($result[$code]['time'])) {
                        $result[$code] = $item;
                    }
                } elseif ($result[$code]['state'] === 1 && $item['state'] === 0) {
                    // 如果已有的是state=1，当前是state=0，替换为state=0的
                    $result[$code] = $item;
                } elseif ($result[$code]['state'] === 1 && $item['state'] === 1) {
                    // 如果两个都是state=1，取time更大的
                    if (strtotime($item['time']) > strtotime($result[$code]['time'])) {
                        $result[$code] = $item;
                    }
                }
            }
        }

// 重置键名（如果需要）
        $result = array_values($result);