Question

我需要使用PHP xml在xmlwriter文件中为每个月添加文章：

$sql = "SELECT *,YEAR(FROM_UNIXTIME(timestamp)) AS YEAR, 
                MONTH(FROM_UNIXTIME(timestamp)) AS MONTH 
         FROM ".NEWS_ARTICLES." GROUP BY YEAR, MONTH ORDER BY YEAR DESC, MONTH ";
$newsdata = DataAccess::Fetch($sql);

foreach($newsdata AS $news){
    $writer->openURI('./cache/xmls/posts-'.$news['MONTH'].'-'.$news['YEAR'].'.xml');  
    $writer->startDocument('1.0','UTF-8');  
    $writer->setIndent(4);
    $writer->startElement('urlset');
    $writer->writeAttribute('xmlns', $xmlns);
    $writer->startElement('url');   
    $writer->writeElement('loc',$news['title']);  
    $writer->endElement();  
    $writer->endElement(); 
    $writer->endDocument();   
    $writer->flush();
}

这适用于我并为每个月生成.xml文件但是没有为每个月添加所有文章标题，我在每个月的文件中只看到one标题！如何在xml文件中添加每个月的所有文章？

我认为我的问题是循环!!!

结果：posts-5-2015.xml

<url>
  <loc>title</loc>
</url>

真的，我有5篇文章需要：

结果：posts-5-2015.xml

<url>
  <loc>title</loc>
</url>
<url>
  <loc>title2</loc>
</url>
<url>
  <loc>title3</loc>
</url>
<url>
  <loc>title4</loc>
</url>
<url>
  <loc>title5</loc>
</url>

print_r($newsdata)结果：注意：这对于大型数据库而言很简单，仅适用于架构

Array
(
    [0] => Array
        (
            [id] => 243
            [title] => test2
            [story] => desc2
            [timestamp] => 1442389680
            [update_time] => 1442389522
            [YEAR] => 2015
            [MONTH] => 9
        )

    [1] => Array
        (
            [id] => 242
            [title] => test1
            [story] => desc
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 1
        )
    [2] => Array
        (
            [id] => 244
            [title] => test3
            [story] => desc3
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 5
        )
    [3] => Array
        (
            [id] => 245
            [title] => test4
            [story] => desc4
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 5
        )
    [4] => Array
        (
            [id] => 246
            [title] => test5
            [story] => desc5
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 5
        )
    [5] => Array
        (
            [id] => 247
            [title] => test6
            [story] => desc6
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 5
        )
    [6] => Array
        (
            [id] => 248
            [title] => test7
            [story] => desc7
            [timestamp] => 1421230680
            [update_time] => 1441026399
            [YEAR] => 2015
            [MONTH] => 5
        )
)

Answer 1

您的问题出在查询中：

$sql = "SELECT *,YEAR(FROM_UNIXTIME(timestamp)) AS YEAR, 
                MONTH(FROM_UNIXTIME(timestamp)) AS MONTH 
         FROM ".NEWS_ARTICLES." GROUP BY YEAR, MONTH ORDER BY YEAR DESC, MONTH ";

MySQL之外的大多数数据库都会拒绝此查询，因为您在选择多个字段时对2个字段进行分组。
group by year, month只显示一个月的单个（随机）行，并隐藏所有其他行。

解决方案是完全删除group by子句并重写查询，如下所示：

$sql = "SELECT *,YEAR(FROM_UNIXTIME(timestamp)) AS YEAR, 
                MONTH(FROM_UNIXTIME(timestamp)) AS MONTH 
         FROM ".NEWS_ARTICLES." ORDER BY YEAR DESC, MONTH ASC";

<强>备注
你没有WHERE条款，这很奇怪。你真的想每次都选择所有文章吗？
更好的方法是通过某些过滤器限制查询中选择的文章数量在数据库中而不是在php中过滤总是更快。

Answer 2

您正在使用每个循环覆盖XML。考虑使用root并在foreach循环之外关闭文档来启动文档：

$writer->openURI('./cache/xmls/posts-'.$news['MONTH'].'-'.$news['YEAR'].'.xml');
$writer->startDocument('1.0','UTF-8'); 
$writer->setIndent(4); 
$writer->startElement('urlset');

foreach ($newsdata as $news){    
  $writer->startElement('url'); 
  $writer->writeElement('loc',$news['title']); 
  $writer->endElement();
}

$writer->endElement(); 
$writer->endDocument(); 
$writer->flush();

使用PHP xmlwriter在xml文件中添加多个数据

2 个答案: