将php数组转换为逗号分隔数组

Question

I am getting data from a row which are a bunch of integers and I need to comma separate them to use them for a chart.js dataset data. So I have got the array here:

if (mysqli_num_rows($result) > 0) {

  $categories = [];
  while($row = mysqli_fetch_assoc($result)) {
    $categories[] = $row;     
  }

echo json_encode($categories);

I need to turn it into json encoded string:

My array echos out as:

[{"respondent_sdo":"2","respondent_dcto":"3","respondent_ed":"5","respondent_ca":"5","respondent_dhpt":"3","respondent_irt":"6","respondent_gl":"2","respondent_il":"5"}]

To which I need the above to output as 2,3,5,5,3,6,5

var dataString= "<?php echo json_encode($categories, JSON_NUMERIC_CHECK);  ?>";
var catData = JSON.parse(dataString);


    var ctx = document.getElementById("myChart1");
    var myChart1 = new Chart(ctx, {
      type: 'radar',
        options: {
             legend: {
                display: true
             },
             tooltips: {
                enabled: false
             },
            scale: {
                ticks: {
                    beginAtZero: true,
                    stepSize: 1
                }
            }         
        },  
      data: {
        labels: ["Strategic Development and Ownership", 
                 "Driving change through others", 
                 "Exec Acumen", 
                 "Commercial Acumen", 
                 "Develops High Performance Teams", 
                 "Innovation and risk taking", 
                 "Global Leadership", 
                 "Industry Leader"
                 ],


        datasets: [{
          label: 'Ian Galbraith',
          backgroundColor: "rgba(255,6255,255,0)",
          borderColor: "lightblue",
          data: catData,
        }]
      }
    }); 

Answer 1

Why don't you change associative array into numeric one in PHP file like:

Instead of:

if (mysqli_num_rows($result) > 0) {

  $categories = [];
  while($row = mysqli_fetch_assoc($result)) {
    $categories[] = $row;     
  }

echo json_encode($categories);

Use:

if (mysqli_num_rows($result) > 0) {

  $categories = [];
  while($row = mysqli_fetch_assoc($result)) {
    $categories[] = $row;     
  }
$response = array();
foreach($categories as $c){
   foreach($c as $val){
      $response[] = (int)$val;
   }
}
echo json_encode($response);

I hope it helps