I tried create a web based data visualization in farm pond water quality monitoring. So , insert water quality sensor data to MySQL database . this data comes form sensor to db every 5 minute.
i wanted to visualize these data to large scale area chart. I tried to get data from MySQL by using php file. But don’t understand how that data feed to graph generation in Realtime a basic,
please help. example code in echart website i download and try to modify it as i require.

<script type="text/javascript">
    
var dom = document.getElementById('chart-container');
var myChart = echarts.init(dom, null, {
  renderer: 'canvas',
  useDirtyRect: false
});
var app = {};

var option;

let base = +new Date(1968, 9, 3);
let oneDay = 24 * 3600 * 1000;
let date = [];

let data = [Math.random() * 300];

for (let i = 1; i < 20000; i++) {
  var now = new Date((base += oneDay));
  date.push([now.getFullYear(), now.getMonth() + 1, now.getDate()].join('/'));
  data.push(Math.round((Math.random() - 0.5) * 20 + data[i - 1]));
}

option = {
  tooltip: {
    trigger: 'axis',
    position: function (pt) {
      return [pt[0], '10%'];
    }
  },
  title: {
    left: 'center',
    text: 'Large Area Chart'
  },
  toolbox: {
    feature: {
      dataZoom: {
        yAxisIndex: 'none'
      },
      restore: {},
      saveAsImage: {}
    }
  },
  xAxis: {
    type: 'category',
    boundaryGap: false,
    data: date
  },
  yAxis: {
    type: 'value',
    boundaryGap: [0, '100%']
  },
  dataZoom: [
    {
      type: 'inside',
      start: 0,
      end: 10
    },
    {
      start: 0,
      end: 10
    }
  ],
  series: [
    {
      name: 'Fake Data',
      type: 'line',
      symbol: 'none',
      sampling: 'lttb',
      itemStyle: {
        color: 'rgb(255, 70, 131)'
      },
      areaStyle: {
        color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
          {
            offset: 0,
            color: 'rgb(255, 158, 68)'
          },
          {
            offset: 1,
            color: 'rgb(255, 70, 131)'
          }
        ])
      },
      data: data
    }
  ]
};



if (option && typeof option === 'object') {
  myChart.setOption(option);
}

window.addEventListener('resize', myChart.resize);

  </script>