Php/ajax以與javascript數組相同的形式返回JSON

Question

我正在使用charts.js插件創建圖表。它使用一個javascript數組data來生成圖表。

var data = { 
    labels: ["January", "February", "March", "April", "May", "June", "July"], 
    datasets: [ 
     { 
      label: "My First dataset", 
      fillColor: "rgba(220,220,220,0.2)", 
      strokeColor: "rgba(220,220,220,1)", 
      pointColor: "rgba(220,220,220,1)", 
      pointStrokeColor: "#fff", 
      pointHighlightFill: "#fff", 
      pointHighlightStroke: "rgba(220,220,220,1)", 
      data: [65, 59, 80, 81, 56, 55, 40] 
     }, 
     { 
      label: "My Second dataset", 
      fillColor: "rgba(151,187,205,0.2)", 
      strokeColor: "rgba(151,187,205,1)", 
      pointColor: "rgba(151,187,205,1)", 
      pointStrokeColor: "#fff", 
      pointHighlightFill: "#fff", 
      pointHighlightStroke: "rgba(151,187,205,1)", 
      data: [28, 48, 40, 19, 86, 27, 90] 
     } 
    ] 
}; 

我想使用ajax返回不同時間範圍的結果。 我怎樣才能生成一個響應與PHP，以便當我在ajax成功讀取它時，我可以使用它與我使用var data生成初始圖表相同的方式。

 $.ajax('/chart.php', { 
      type: 'POST', 
      data: {range: range}, 
      dataType: 'json', 
      success: function(data) { 
       console.log(data); 
      } 
     }); 

Answer 1

你想要的是創建對象的數組，然後使用json_encode，它應該產生你所需要的。試試這個：

$array = array(); 
$dataset = new stdClass; 
$dataset->label = "My first dataset"; 
// repeat for each field 
$array[] = $dataset; 
echo json_encode($array); 

我們可以做些什麼來縮短這個是不是每一次我們可以use an array and typecast it to an object這樣聲明一個新的數據集：

$datasets = array(); 
$datasets[] = (object) array(
    'label' => "My First dataset", 
    'fillColor' => "rgba(220,220,220,0.2)", 
    'strokeColor' => "rgba(220,220,220,1)", 
    'pointColor' => "rgba(220,220,220,1)", 
    'pointStrokeColor' => "#fff", 
    'pointHighlightFill' => "#fff", 
    'pointHighlightStroke' => "rgba(220,220,220,1)", 
    'data' => [65, 59, 80, 81, 56, 55, 40] 
); 

Check out this eval.in的工作示例。

更新

爲了您的完整結構，你需要：

$data = (object) [ 
    'labels' => ["January", "February", "March", "April", "May", "June", "July"], 
    datasets => [] 
]; 

$data->datasets[] = (object) [ 
    'label' => "My First dataset", 
    'fillColor' => "rgba(220,220,220,0.2)", 
    'strokeColor' => "rgba(220,220,220,1)", 
    'pointColor' => "rgba(220,220,220,1)", 
    'pointStrokeColor' => "#fff", 
    'pointHighlightFill' => "#fff", 
    'pointHighlightStroke' => "rgba(220,220,220,1)", 
    'data' => [65, 59, 80, 81, 56, 55, 40] 
]; 

echo json_encode($data);