PHP和XML。使用PHP循环访问XML文件 [英] PHP and XML. Looping through an XML file with PHP

问题描述

我现在正深深地尝试着使用PHP来处理这个XML文件（下面是实际的XML文本）（下面的XML文件内容）。
我正在尝试做什么如下：

1. 获取所有文件夹元素名称


2. 如果文件夹元素具有是子文件夹属性，然后向下移动一级并获取该文件夹元素的名称


3. 如果不移动到下一个文件夹元素
   

gallerylist.xml：

 <？xml version =1.0encoding =ISO-8859 -1\" >？; 
< gallerylisting exists =yes> 
< folder subfolder =yes> 
活动
< folder子文件夹=是> 
 Beach_Clean_2010 
< folder subfolder =no> 
 Onna_Village 
< /文件夹> 
< folder subfolder =no> 
 Sunabe_Sea_Wall 
< / folder> 
< /文件夹> 
< /文件夹> 
< folder subfolder =no> 
 Food_And_Drink 
< / folder> 
< folder subfolder =no> 
里面
< /文件夹> 
< folder subfolder =no> 
位置
< /文件夹> 
< folder subfolder =no> 
夜生活
< /文件夹> 
< / gallerylisting> 
  

gallerylisting.php

 <？php 
 $ xmlref = simplexml_load_file（gallerylisting.xml）; 
 foreach（$ xmlref-> children（）as $ child）{
 foreach（$ child-> attributes（）as $ attr => $ attrVal）{
 print $ child ; 
 if（$ attrVal ==yes）{
 foreach（$ child-> children（）as $ child）{
 echo $ child; 
 foreach（$ child-> attributes（）as $ attr => $ attrVal）{
 if（$ attrVal ==yes）{
 foreach（$ child-> children（）as $ child）{
 echo $ child; 
} 
} 
} 
} 
} 
} 
} 
  

我是...计数... 5 foreach循环深入这个PHP脚本，我不喜欢它，再加上如果我的文件夹有另一个子文件夹，我会不得不添加同样的

  $ if（attrVal ==yes）...等等。 
  

再次以及...不！无论如何，我可以避免这一点。我是PHP的新手，尤其是PHP和XML。

感谢您的帮助。

解决

 <？php 
 $ b方案

递归可能对您有益。 $ b函数display_entities（$ xml）
{
foreach（$ xml-> children（）as $ child）{
foreach（$ child-> attributes（）as $ attr = > $ attrVal）{
print $ child;
if（$ attrVal ==yes）{
display_entities（$ child-> children（））;




$ xmlref = simplexml_load_file（gallerylisting.xml）;

display_entities（$ xmlref-> children（））;


I am knee deep in foreach purgatory right now trying to come up with a way to traverse this XML file (actual XML text below) with PHP(following the XML file content.) What I am trying to do is the following:

1. Get all folder element names
2. If the folder element has yes as a subfolder attribute, then move a level down and grab that folder element's name
3. If not move on to the next folder element

gallerylist.xml:

<?xml version="1.0" encoding="ISO-8859-1"?>
<gallerylisting exists="yes">
<folder subfolder="yes">
Events
   <folder subfolder="yes">
   Beach_Clean_2010
        <folder subfolder="no">
        Onna_Village
        </folder>
            <folder subfolder="no">
            Sunabe_Sea_Wall
        </folder>
        </folder>
  </folder>
  <folder subfolder="no">
  Food_And_Drink
  </folder>
  <folder subfolder="no">
  Inside
  </folder>
  <folder subfolder="no">
  Location
  </folder>
  <folder subfolder="no">
  NightLife
  </folder>
</gallerylisting>

gallerylisting.php

<?php
$xmlref = simplexml_load_file("gallerylisting.xml");
foreach($xmlref->children() as $child) {
    foreach($child->attributes() as $attr => $attrVal) {
        print $child;
        if($attrVal == "yes") {
            foreach($child->children() as $child) {
                echo $child;
                foreach($child->attributes() as $attr => $attrVal) {
                    if($attrVal == "yes") {
                        foreach($child->children() as $child) {
                            echo $child;
                        }
                    }                   
                }
            }
        }
    }
}

I am...counting...5 foreach loops deep into this PHP script and I do not like it at all, plus if my folders had another subfolder, I would have to add this same

$if(attrVal=="yes")...etc.

in again and well...no! Is there anyway at all that I can avoid this. I'm new to PHP, and especially PHP and XML.

Thanks for any help.

解决方案

Recursion could be beneficial to you here.

<?php

function display_entities( $xml )
{
    foreach($xml->children() as $child) {
        foreach($child->attributes() as $attr => $attrVal) {
            print $child;
            if($attrVal == "yes") {
              display_entities( $child->children() );
            }
        }
    }
}

$xmlref = simplexml_load_file("gallerylisting.xml");

display_entities($xmlref->children());

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