php 第 1 行第 6 列错误：仅在文档开头允许 XML 声明
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error on line 1 at column 6: XML declaration allowed only at the start of the document
提问by nitroman
I was trying to build an XML file. But stuck with an error. I am including the code and error. Thanks in advance.
我试图构建一个 XML 文件。但是遇到了一个错误。我包括代码和错误。提前致谢。
<?php
mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("comrade") or die(mysql_error());
$data = mysql_query("SELECT * FROM support WHERE DATE(`date`) = CURDATE()")
or die(mysql_error());
$xml = new SimpleXMLElement('<xml/>');
while($info = mysql_fetch_array( $data ))
{
$support = $xml->addChild('support');
$support->addChild('cus_name',$info['com_name']);
$support->addChild('ser_type',$info['ser_type']);
}
Header('Content-type: text/xml');
print($xml->asXML());
?>
It showing the following error
它显示以下错误
Below is a rendering of the page up to the first error.
回答by Elia Weiss
In short, you should do:
简而言之，你应该这样做：
ob_clean(); //Clean (erase) the output buffer
print($xml->asXML());
explain: if any of the included files print a new line you will get
解释：如果任何包含的文件打印一个新行，你会得到
error on line 2 at column 6: XML declaration allowed only at the start of the document
第 2 行第 6 列错误：仅在文档开头允许 XML 声明
it could be because in some file the <?phptag start after an empty line.
这可能是因为在某些文件中，<?php标记在空行之后开始。
so instead of searching the file that cause the error, simply clean the output buffer.
因此，无需搜索导致错误的文件，只需清理输出缓冲区即可。
回答by MonkeyZeus
Your issue is the placement of Header('Content-type: text/xml');
你的问题是放置 Header('Content-type: text/xml');
Try this and make sure NOTHINGcomes before the header()call:
试试这个并确保在调用之前没有任何内容header()：
<?php
header('Content-type: text/xml');
mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("comrade") or die(mysql_error());
$data = mysql_query("SELECT * FROM support WHERE DATE(`date`) = CURDATE()")
or die(mysql_error());
$xml = new SimpleXMLElement('<xml/>');
while($info = mysql_fetch_array( $data ))
{
$support = $xml->addChild('support');
$support->addChild('cus_name',$info['com_name']);
$support->addChild('ser_type',$info['ser_type']);
}
print($xml->asXML());
?>
回答by Mike Ivy
Sometimes saving UTF-8 with/without BOM could solve this (and similar) issues. Some special byte could exist in the very beginning of file in case of wrong saving method.
有时使用/不使用 BOM 保存 UTF-8 可以解决这个（和类似的）问题。如果保存方法错误，文件开头可能会存在一些特殊字节。
