dou4121 2011-10-29 10:46
浏览 90

json_encode php结果为NULL? [重复]

Possible Duplicate:
json_encode is returning NULL?

I'm having a strange problem with json_encode() in php. Pretty simple code:

$content = json_encode(array('content1' => $arm_length,
                             'content2' => $body_length));
echo $content;

$arm_length and $body_length variables contain the HTML markup for two select dropdown menus. My problem is when it echo's out it show's NULL for content1 and content2. If I take the json_encode() away and just do print_r($content) it shows all the data as it should be.

Does anyone know what's happening here? Is there certain data that can't be parsed into JSON? I've done this a few times now using Ajax/PHP and never had any problems.

Cheers for any help with this.

  • 写回答

2条回答 默认 最新


      相关推荐 更多相似问题


      • ¥15 MATLAB 调用comsol如何加速设计?
      • ¥15 echarts地图添加点击事件
      • ¥15 不知道带什么标题好随便搞一个吧
      • ¥15 ffmpeg 图片合成视频
      • ¥15 软科大学爬取获取所有数据
      • ¥15 如何修改损失函数以及代码讲解
      • ¥15 有偿咨询!!程序的小数点怎么取到后四位啊!
      • ¥15 IRS智能反射面相关文章代码
      • ¥15 landsat5的两幅影像镶嵌前波段是123457,为什么镶嵌后波段变成了123456?
      • ¥15 关于#matlab#中fmincon函数如何处理约束问题?