foreach 生成一个数组，如何获取元素的值而不是数组？

Question

我是一个外行 PHP 用户试图生成 XML RSS 文档，
使用 PHP class RSS_PHP RSS Parser

foreach returns 30 <items> 这很好，因为那是 xml 源上的项目数，但是在尝试获取 xml 的值时=16=] 结果是 Array

我不知道我遗漏了什么或需要更改什么才能从 source 而不是数组中获取 <title> 的值。

非常感谢任何帮助，谢谢。

<?php 
require_once 'rss_php.php';
header('Content-Type: text/xml; charset=utf-8', true); //set document header content type to be XML

 $xml = new SimpleXMLElement('<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom"></rss>');
 $xml->addAttribute('version', '2.0');

 $rss = new rss_php;
    $rss->load('http://rss.tvguide.com/breakingnews');
    $items = $rss->getItems();
 
 $channel = $xml->addChild('channel'); //add channel node
 $title = $channel->addChild('title','Channel Title Here'); //title of the feed
 $link = $channel->addChild('link','http://www.zstreambox.com'); //feed site
 $description = $channel->addChild('description','Channel description here'); //feed description
 $language = $channel->addChild('language','en-us'); //language
 $ttl = $channel->addChild('ttl','120'); //time
 $image = $channel->addChild('image'); //add atom node
 $url = $image->addChild('url','http://static.tvgcdn.net/www/img/tvguide-feed-logo.png'); //add channel image
 $title = $image->addChild('title','ZSB: Breaking News'); //add channel title
 $link = $image->addChild('link','http://www.zstreambox.com'); //add channel link


 foreach($items as $index => $item) {  
  $item = $channel->addChild('item'); //add item node
  $title = $item->addChild('title', $item['title']); //add title node

}

 echo $xml->asXML();

?>

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
<channel>
<title>Channel Title Here</title>
<link>http://www.zstreambox.com</link>
<description>Channel description here</description>
<language>en-us</language>
<ttl>120</ttl>
<image>...</image>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
<item>...</item>
</channel>
</rss>

PHPClass网站提供的例子是：

<?php
require_once 'rss_php.php';    

    $rss = new rss_php;
    $rss->load('http://digg.com/rss/index.xml');
    $items = $rss->getItems();

    $html = '';
    foreach($items as $index => $item) {
        $html .= '<p><a href="'.$item['link'].'" title="'.$item['title'].'"><strong>'.$item['title'].'</strong></a><br />
                    '.$item['description'].'<br />
                    Submitted by: <a href="'.$item['digg:submitter']['digg:userimage'].'">'.$item['digg:submitter']['digg:username'].'</a> :: '.$item['pubDate'].'<br />
                    Diggs: '.$item['digg:diggCount'].' :: <em>Category: '.$item['digg:category'].'</em>
                    </p>';
    }
    
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Digg Front Page</title>
</head>

<body>
<?php
echo $html;
?>
</body>
</html>

我只想包含更正后的工作代码以备不时之需感谢在这个很棒的网站上分享和帮助的了不起的人

<?php 
require_once 'rss_php.php';
header('Content-Type: text/xml; charset=utf-8', true); //set document header content type to be XML

 $xml = new SimpleXMLElement('<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom"></rss>');
 $xml->addAttribute('version', '2.0');

 $rss = new rss_php;
    $rss->load('http://rss.tvguide.com/breakingnews');
    $items = $rss->getItems();
 
 $channel = $xml->addChild('channel'); //add channel node
 $title = $channel->addChild('title','Channel Title Here'); //title of the feed
 $link = $channel->addChild('link','http://www.zstreambox.com'); //feed site
 $description = $channel->addChild('description','Channel description here'); //feed description
 $language = $channel->addChild('language','en-us'); //language
 $ttl = $channel->addChild('ttl','120'); //time
 $image = $channel->addChild('image'); //add atom node
 $url = $image->addChild('url','http://static.tvgcdn.net/www/img/tvguide-feed-logo.png'); //add channel image
 $title = $image->addChild('title','ZSB: Breaking News'); //add channel title
 $link = $image->addChild('link','http://www.zstreambox.com'); //add channel link


 foreach($items as $index => $item) {        
     $xml_item = $channel->addChild('item'); //add item node
     $title = $xml_item->addChild('title', ''.$item['title'].''); 
     $description = $xml_item->addChild('description', ''. $item['description'] . '');
 }

 echo $xml->asXML();

?>

Answer 1

基于 RSS parser 中的示例，每个 $item 都是一个关联数组，其中包含 title 和 description 等键。 ['title'] 是一个包含一个字符串的数组文字，'title'，如果你想访问一个项目的标题，你会使用 $item['title'] 给你这样的东西：

$title = $item->addChild('title', $item['title']); //add title node

Answer 2

您了解 foreach 中的 $item 变量发生了什么吗？

foreach($items as $index => $item) {        
    // here $item in a item of RSS feed
    $item = $xml->addChild('item'); //add item node
    // and here $item is an XML-node
    // and as it is an XML-node now - 
    // it doesn't have `title` or `description` property
    $title = $item->addChild('title', ''.['title'].''); //add title node    
    $description = $item->addChild('description', ''. ['description'] . ''); //add description
}

正确代码：

foreach($items as $index => $item) {        
    $xml_item = $xml->addChild('item'); //add item node
    $title = $xml_item->addChild('title', ''.$item['title'].''); 
    $description = $xml_item->addChild('description', ''. $item['description'] . '');
}

foreach 生成一个数组，如何获取元素的值而不是数组？

foreach results in an array, how can I get the value of element instead of an array?

javascript

php

xml

rss