我需要使用 PHP xmlwriter 在 xml 文件中添加每个月的文章:

$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();
}

这对我有用并为每个月生成 .xml 文件但没有为每个月添加所有文章标题，我在每个月文件中只看到 一个 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>

在 Really 中我有 5 篇文章并且需要:

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 DB 很简单，仅适用于模式

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
        )
)

最佳答案

您的问题在查询中:

$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 ";  

除 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的同时对 2 个字段进行分组。
group by year, month 将仅显示一个月中的单个(随机)行并隐藏所有其他行。

解决方案是完全删除 group by 子句并像这样重写查询:

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

备注
奇怪的是您没有 WHERE 子句。您真的要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。
在数据库中过滤总是比在 php 中过滤更快。

关于php - 使用 PHP xmlwriter 在 xml 文件中添加多个数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38180853/