highcharts中的json数据转换问题请教

比如我从php获取了json数据如下：

data = {"Firefox":45,"IE":26.8,"Chrome":{"name":"chrome","y":28.2,"sliced":true},"Safari":8.5,"Opera":6.2,"Others":0.7}

但他series中的data数据如下：

            series: [{

                type: 'pie',

                name: 'Browser share',

                data: [

                    ['Firefox',   45.0],

                    ['IE',       26.8],

                    {

                        name: 'Chrome',

                        y: 12.8,

                        sliced: true,

                        selected: true

                    },

                    ['Safari',    8.5],

                    ['Opera',     6.2],

                    ['Others',   0.7]

                ]

            }]

我怎么将上面的data转换成下面的data