数据表 json 解析错误

这是一个

常见的问题，我已经研究了谷歌可以提供的所有答案，所以我很抱歉再次问它。

Firebug 将响应显示为

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
{ "aaData" : [ [ "A",
        "0.67",
        "0.66",
        "0.66",
        "0.66",
        "0.78",
        "1.52",
        "0.00",
        "0.00",
        "-15.38",
        "1970-01-01"
      ],
      [ "AA",
        "0.11",
        "0.12",
        "0.12",
        "0.14",
        "0.12",
        "-8.33",
        "0.00",
        "-14.29",
        "16.67",
        "2013-04-08"
      ],
      [ "AACC",
        "0.03",
        "0.04",
        "0.04",
        "0.04",
        "0.10",
        "-25.00",
        "0.00",
        "0.00",
        "-60.00",
        "2013-03-04"
      ],
      [ "AAN",
        "0.50",
        "0.50",
        "0.50",
        "0.50",
        "0.49",
        "0.00",
        "0.00",
        "0.00",
        "2.04",
        "2013-02-04"
      ],
      [ "AAON",
        "0.23",
        "0.23",
        "0.22",
        "0.22",
        "0.20",
        "0.00",
        "4.55",
        "0.00",
        "10.00",
        "2013-03-11"
      ],
      [ "AAP",
        "0.76",
        "0.76",
        "0.76",
        "0.76",
        "0.76",
        "0.00",
        "0.00",
        "0.00",
        "0.00",
        "2013-02-07"
      ],
      [ "AAPL",
        "13.42",
        "13.34",
        "13.30",
        "13.34",
        "15.45",
        "0.60",
        "0.30",
        "-0.30",
        "-13.66",
        "2013-01-    23"
      ]
    ],
  "iTotalDisplayRecords" : "7",
  "iTotalRecords" : "7",
  "sEcho" : 1
}

jsonlint.com 说 JSON 是有效的，但为什么 apache 将 Doctype 放在响应前面？这是导致错误的原因吗？

Firebug 还将标头报告为：

Connection  Keep-Alive
Content-Length  798
Content-Type    application/json
Date    Wed, 23 Jan 2013 09:18:35 GMT
Keep-Alive  timeout=5, max=100
Server  Apache/2.2.22 (Ubuntu)
X-Powered-By    PHP/5.4.6-1ubuntu1.1

我正在使用数据表中的server_processing.php脚本

header('Content-Type: application/json');
echo $output;

我的 php 的相关部分是：

    $(document).ready(function() {
                $('#example').dataTable( {
                    "bProcessing": true,
                    "bServerSide": true,
                    "sAjaxSource": "server_processing.php",
                    "sPaginationType": "full_numbers"
                } );
            } );
        </script>
    </head>
    <body>
    <div id="dynamic">
    <table cellpadding="0" cellspacing="0" border="0" class="display" id="example">
    <thead>
        <tr>
            <th>Symbol</th>
            <th>Current Estimate</th>
            <th>7 days ago</th>
            <th>30 days ago</th>
            <th>60 days ago</th>
            <th>90 days ago</th>
            <th>% Change Current</th>
            <th>% Change 7</th>
            <th>% Change 30</th>
            <th>% Change 60</th>
            <th>Next Earnings Date</th></th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td colspan="10" class="dataTables_empty">Loading data from server</td>
        </tr>
    </tbody>
    <tfoot>
        <tr>
            <th>Symbol</th>
            <th>Current Estimate</th>
            <th>7 days ago</th>
            <th>30 days ago</th>
            <th>60 days ago</th>
            <th>90 days ago</th>
            <th>% Change Current</th>
            <th>% Change 7</th>
            <th>% Change 30</th>
            <th>% Change 60</th>
        </tr>
    </tfoot>
   </table>

我已经浪费了很多时间试图解决这个问题，所以我非常感谢任何帮助。

我发现了我的问题。我有一个添加文档类型的前置函数。一旦删除，一切都很好。我通过将我的代码移动到另一个没有前缀的开发站点来找到它，它起作用了。

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