dcat-admin如何自定義donut圖表的formatter閉包

    /**
     * 初始化圖表配置
     */
    protected function setUpOptions()
    {
        $this->options([
            "chart" => [
                "type" => 'donut'
            ],
            "series" =>  [],
            'labels' =>  [
                "show"=>true
            ],
            "datalabels"=>[
                "enabled"=>true,
                'enabledOnSeries'=>'undefined',
            ],
            'plotOptions' => [
                'pie' => [
                    'donut' => [
                        'size' => '65%',
                        'labels' => [
                            "show" => true,
                            "name" => [
                                "show" => true
                            ],
                            "value" => [
                                "show" => true
                            ],
                            "total" => [
                                "show" => true,
                                "showAlways" => true,
                                "label" => '總收入',
                                "fontSize" => '22px',
                                "fontFamily" => 'Helvetica, Arial, sans-serif',
                                "fontWeight" => 600,
                                "formatter"=> function ($w) {
                                    return round($w,2);
                                }                    
                            ]
                        ]
                    ]
                ]
            ],
        ]);
    }

我的目的是想獲取一個兩位數的總數,但是不曉得怎麼把下方 js 程式碼轉為 php

php
                                "formatter"=> function ($w) {
                                    return round($w,2);
                                }     
js
          formatter: function (w) {
            return w
          }

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