Php将数组转换为JSON

Question

请问如何将数组转换为JSON格式， 我试过使用以下方法，但没有这样做，任何想法？

这是我目前的结果：

["B型肝炎疫苗下一個注射期为2017-06-30 ","96709394"]
["疫苗名稱4下一個注射期为2017-06-30 ","96709394"]

我想要的是什么：

{"B型肝炎疫苗下一個注射期为2017-06-30 ","96709394"},
{"疫苗名稱4下一個注射期为2017-06-30 ","96709394"}

谢谢

while($row = mysql_fetch_array( $result )) {

echo "<tr>";
echo '<td>' . $row['id'] . '</td>';
echo '<td>' . $row['patientid'] . '</td>';
echo '<td>' . $row['vaccineid'] . '</td>';
echo '<td>' . $row['vaccinename1'] . '</td>';
echo '<td>' . $row['totalnoofinjection'] . '</td>';
echo '<td>' . $row['nthinjection'] . '</td>';
echo '<td>' . $row['date'] . '</td>';
echo '<td>' . $row['nextdate'] . '</td>';
echo '<td>' . $row['skip'] . '</td>';
echo '<td>' . $row['traditionalmessage'] ."<br />";
echo '<td>' . $row['traditionalmessage'] . '</td>';
echo '<td>' . $row['telMobile'] . '</td>';

$data_array = [$row['traditionalmessage'],$row['telMobile']];
foreach($data_array as $key => $value){
 $new_data_array[urlencode($key)] = urlencode($value);
 }
 $data_json_url = json_encode($new_data_array);

$data_json = urldecode($data_json_url);

echo $data_json;