Php变量发送到js [重复]

I've got a problem to pass a var from php to js. BUT, I've already read all the related topics without finding any clue... I've got a js script, which contains the part

data: [
  { dt: '2009', value: 10 },
  { dt: '<?= $vstDate[0] ?>', value: 20 },
  { dt: '2009', value: 10 },
],

Then, what I'd like to do is adding a given number of vars, stored in a php array. I tried this, without getting it to work :

data: [
  <?php
    for($i=0; $i<=count($vststats)-1; $i+=1) {
    echo json_encode("{ dt: ".$vststats[$i].", value: 5 },");
    }
  ?>
],

Please, how could I make it working ? All my thanks in advance !

</div>

First make an array in php and in end pass array to JSON_ENCODE

//Array
$temp = array(array('dt'=>2009,'value'=>10), array('dt'=>2010,'value'=>10))

//json encode
echo json_encode($temp);