title: php json encode - array keys not output as strings
body: <p>So I have a php array like this:</p>
  
  <pre><code>$myArray = array(
  'name' =&gt; 'Series Name',
  'data' =&gt; array(
      array("2012-11-13",0.71),
      array("2012-11-14",0.45),
      array("2012-11-15",0.65),
      array("2012-11-16",0.67),
      )
  );
  </code></pre>
  
  <p>I would like to output this array in json_encoded form with the array keys as object names(?).
  When I <code>echo json_encode</code> the array I get this:</p>
  
  <pre><code>{
      "name": "Series Name",
      "data": [
          [
              "2012-11-13",
              0.71
          ],
          [
              "2012-11-14",
              0.45
          ],
          [
              "2012-11-15",
              0.65
          ],
          [
              "2012-11-16",
              0.67
          ]
      ]
  }
  </code></pre>
  
  <p>The trouble with this is that the array keys ("name" and "data") are output as strings. I need them to be objects. I.e. without the quotes around them.</p>
  
  <p>EDIT:
  The purpose is this is to build and use a php array with highcharts. As can be seen in the source of <a href="http://www.highcharts.com/demo/spline-irregular-time" rel="nofollow">this chart</a> the data is passed in that way:</p>
  
  <pre><code>$(function () {
          $('#container').highcharts({
              chart: {
                  type: 'spline'
              },
              title: {
                  text: 'Snow depth in the Vikjafjellet mountain, Norway'
              },
              subtitle: {
                  text: 'An example of irregular time data in Highcharts JS'
              },
              xAxis: {
                  type: 'datetime',
                  dateTimeLabelFormats: { // don't display the dummy year
                      month: '%e. %b',
                      year: '%b'
                  }
              },
              yAxis: {
                  title: {
                      text: 'Snow depth (m)'
                  },
                  min: 0
              },
              tooltip: {
                  formatter: function() {
                          return '&lt;b&gt;'+ this.series.name +'&lt;/b&gt;&lt;br/&gt;'+
                          Highcharts.dateFormat('%e. %b', this.x) +': '+ this.y +' m';
                  }
              },
  
              series: [{
                  name: 'Winter 2007-2008',
                  // Define the data points. All series have a dummy year
                  // of 1970/71 in order to be compared on the same x axis. Note
                  // that in JavaScript, months start at 0 for January, 1 for February etc.
                  data: [
                      [Date.UTC(1970,  9, 27), 0   ],
                      [Date.UTC(1970, 10, 10), 0.6 ],
                      [Date.UTC(1970, 10, 18), 0.7 ],
                      [Date.UTC(1970, 11,  2), 0.8 ],
                      [Date.UTC(1970, 11,  9), 0.6 ],
                      [Date.UTC(1970, 11, 16), 0.6 ],
                      [Date.UTC(1970, 11, 28), 0.67],
                      [Date.UTC(1971,  0,  1), 0.81],
                      [Date.UTC(1971,  0,  8), 0.78],
                      [Date.UTC(1971,  0, 12), 0.98],
                      [Date.UTC(1971,  0, 27), 1.84],
                      [Date.UTC(1971,  1, 10), 1.80],
                      [Date.UTC(1971,  1, 18), 1.80],
                      [Date.UTC(1971,  1, 24), 1.92],
                      [Date.UTC(1971,  2,  4), 2.49],
                      [Date.UTC(1971,  2, 11), 2.79],
                      [Date.UTC(1971,  2, 15), 2.73],
                      [Date.UTC(1971,  2, 25), 2.61],
                      [Date.UTC(1971,  3,  2), 2.76],
                      [Date.UTC(1971,  3,  6), 2.82],
                      [Date.UTC(1971,  3, 13), 2.8 ],
                      [Date.UTC(1971,  4,  3), 2.1 ],
                      [Date.UTC(1971,  4, 26), 1.1 ],
                      [Date.UTC(1971,  5,  9), 0.25],
                      [Date.UTC(1971,  5, 12), 0   ]
                  ]
              }, {
                  name: 'Winter 2008-2009',
                  data: [
                      [Date.UTC(1970,  9, 18), 0   ],
                      [Date.UTC(1970,  9, 26), 0.2 ],
                      [Date.UTC(1970, 11,  1), 0.47],
                      [Date.UTC(1970, 11, 11), 0.55],
                      [Date.UTC(1970, 11, 25), 1.38],
                      [Date.UTC(1971,  0,  8), 1.38],
                      [Date.UTC(1971,  0, 15), 1.38],
                      [Date.UTC(1971,  1,  1), 1.38],
                      [Date.UTC(1971,  1,  8), 1.48],
                      [Date.UTC(1971,  1, 21), 1.5 ],
                      [Date.UTC(1971,  2, 12), 1.89],
                      [Date.UTC(1971,  2, 25), 2.0 ],
                      [Date.UTC(1971,  3,  4), 1.94],
                      [Date.UTC(1971,  3,  9), 1.91],
                      [Date.UTC(1971,  3, 13), 1.75],
                      [Date.UTC(1971,  3, 19), 1.6 ],
                      [Date.UTC(1971,  4, 25), 0.6 ],
                      [Date.UTC(1971,  4, 31), 0.35],
                      [Date.UTC(1971,  5,  7), 0   ]
                  ]
              }, {
                  name: 'Winter 2009-2010',
                  data: [
                      [Date.UTC(1970,  9,  9), 0   ],
                      [Date.UTC(1970,  9, 14), 0.15],
                      [Date.UTC(1970, 10, 28), 0.35],
                      [Date.UTC(1970, 11, 12), 0.46],
                      [Date.UTC(1971,  0,  1), 0.59],
                      [Date.UTC(1971,  0, 24), 0.58],
                      [Date.UTC(1971,  1,  1), 0.62],
                      [Date.UTC(1971,  1,  7), 0.65],
                      [Date.UTC(1971,  1, 23), 0.77],
                      [Date.UTC(1971,  2,  8), 0.77],
                      [Date.UTC(1971,  2, 14), 0.79],
                      [Date.UTC(1971,  2, 24), 0.86],
                      [Date.UTC(1971,  3,  4), 0.8 ],
                      [Date.UTC(1971,  3, 18), 0.94],
                      [Date.UTC(1971,  3, 24), 0.9 ],
                      [Date.UTC(1971,  4, 16), 0.39],
                      [Date.UTC(1971,  4, 21), 0   ]
                  ]
              }]
          });
      });
  </code></pre>
  
  <p>Is this json or another way of forming javascript objects?</p>