dongsong8932 2015-12-31 03:10
浏览 41
已采纳

访问具有谓词属性的XML元素,该属性在PHP中动态更新

Newbie here.Trouble with xpath() function in PHP.

XML file (data.xml):

<?xml version="1.0" ?> 
<menu>
<food type="Pizza">

    <item>
            <name>  Tomato &amp; Cheese  </name>
            <small price="5.50"/>
            <large price="9.75"/>

    </item>

    <item>
            <name>   Onions </name>
            <small price="6.85"/>
            <large price="10.85"/>

    </item>
</food>
</menu>

PHP code:

   <?php 
   $xml = simplexml_load_file("data.xml");
   $types = $xml->xpath("/menu/food/@type");
   foreach($types as $type){
      echo("<h1>$type</h1>");
      $menu = $xml->xpath("/menu/food[@type=$type]");     
      echo("<ul>");
      foreach($menu as $submenu){
         echo ("<li>$submenu</li>");
      }
      echo("</ul>");
   } 
   ?>

I have many types of food. I would like to access them and their subtypes in order. There is something wrong with my approach above. I can't seem to find it. Below is my intended output. How do I arrive at that with xpath()?

Intended Output:

PIZZA

=>Tomato & Cheese

=> Onions

=>

FOO

=> BAR

展开全部

  • 写回答

2条回答 默认 最新

  • dtq81142 2015-12-31 03:20
    关注

    You need only a single xpath query, like this:

    $xml = simplexml_load_file("data.xml");
    
    // Get food items and iterate over them
    $foods = $xml->xpath("/menu/food");
    foreach($foods as $food){
    
        // print type attribute
        echo("<h1>{$food["type"]}</h1>");
    
        // Iterate over food items and print their names
        echo("<ul>");
        foreach($food->item as $item){
            echo ("<li>$item->name</li>");
        }
        echo("</ul>");
    }
    

    Having this xml:

    <?xml version="1.0" ?>
    <menu>
    <food type="Pizza">
        <item>
                <name>Tomato &amp; Cheese</name>
                <small price="5.50"/>
                <large price="9.75"/>
        </item>
        <item>
                <name>Onions</name>
                <small price="6.85"/>
                <large price="10.85"/>
        </item>
    </food>
    <food type="Pasta">
        <item>
                <name>Bolognese</name>
                <small price="5.50"/>
                <large price="9.75"/>
        </item>
        <item>
                <name>Carbonara</name>
                <small price="6.85"/>
                <large price="10.85"/>
        </item>
    </food>
    </menu>
    

    ... the above code will produce:

    <h1>Pizza</h1>
    <ul>
      <li>Tomato & Cheese</li>
      <li>Onions</li>
    </ul>
    
    <h1>Pasta</h1>
    <ul>
      <li>Bolognese</li>
      <li>Carbonara</li>
    </ul>
    

    展开全部

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)
编辑
预览

报告相同问题?

悬赏问题

  • ¥15 没输出运行不了什么问题
  • ¥20 输入import torch显示Intel MKL FATAL ERROR,系统驱动1%,: Cannot load mkl_intel_thread.dll.
  • ¥15 点云密度大则包围盒小
  • ¥15 nginx使用nfs进行服务器的数据共享
  • ¥15 C#i编程中so-ir-192编码的字符集转码UTF8问题
  • ¥15 51嵌入式入门按键小项目
  • ¥30 海外项目,如何降低Google Map接口费用?
  • ¥15 fluentmeshing
  • ¥15 手机/平板的浏览器里如何实现类似荧光笔的效果
  • ¥15 盘古气象大模型调用(python)
手机看
程序员都在用的中文IT技术交流社区

程序员都在用的中文IT技术交流社区

专业的中文 IT 技术社区,与千万技术人共成长

专业的中文 IT 技术社区,与千万技术人共成长

关注【CSDN】视频号,行业资讯、技术分享精彩不断,直播好礼送不停!

关注【CSDN】视频号,行业资讯、技术分享精彩不断,直播好礼送不停!

客服 返回
顶部