title: Display time without quotes
body: <p>I got below code;</p>
  
  <pre><code>$dy = $s[$i]['time'];
  $date = date("Y/m/d", $dy);
  
  $price = $s[$i]['price'];
  </code></pre>
  
  <p>which displays $date as 2018-05-03 and $price as 900. However if I use;</p>
  
  <pre><code>$array[] = array($date,$price);
  
  echo json_encode($array);
  </code></pre>
  
  <p>the result is displayed as [["2018/05/03",900]] </p>
  
  <p>How do I remove "" from the date so that it gets [[2018/05/03,900]]  displayed instead?</p>