Question

这让我发疯了。我可以复制并粘贴我需要的2个值，并且在30分钟前完成了这个，但我试图这样做了＃34;正确＆＃34;。

只有一个＆＃34;用户名＆＃34;在整个文件中。我怎么得到它？我尝试使用xpath（$username=$xml->xpath('default_setup/connection/username');），我尝试将节点链接到它（$ username = $ xml-＆gt; {...这里的完整路径...} - ＆gt; default_setup-＆gt; connection-＆gt ; username;`）。

当我print_r($xml)时，我可以看到我想要的所有节点及其值。当我print_r($username)我什么都没得到。

<?php
$xml = simplexml_load_file('database.xml',NULL,LIBXML_NOCDATA); // connection details are inside of CDATA

$username=$xml->xpath('default_setup/connection/username'); ?>
<p>Username: <?= (string)$username ?></p><?php // outputs "Array"

<?php
foreach($xml as $element) {
        echo $element . '<br />'; // outputs '<br />' 2 times.
}
?>
<pre>
Username:
<?php print_r($username) ?><?php // nothing ?>
xml:
<?php print_r($xml) ?><?php // full set of all nodes with everything I need just out of reach ?>
</pre>

以下是xml示例。（实际上是Magento＆＃34; app / etc / local.xml＆＃34;文件）

<default_setup>
    <connection>
        <host><![CDATA[localhost]]></host>
        <username><![CDATA[secret_username]]></username>
        <password><![CDATA[secret_password]]></password>
        <dbname><![CDATA[testing_database]]></dbname>
        <initStatements><![CDATA[SET NAMES utf8]]></initStatements>
        <model><![CDATA[mysql4]]></model>
        <type><![CDATA[pdo_mysql]]></type>
        <pdoType><![CDATA[]]></pdoType>
        <active>1</active>
    </connection>
</default_setup>

Answer 1

你遗漏了一些你想要的路径链节点：

$conn = $xml->global->resources->default_setup->connection;
$user = (string) $conn->username;
$pass = (string) $conn->password;

你可以在这里使用xpath，但实际上它更麻烦，因为它总会返回一个节点数组（NodeList的表示），所以你必须循环它或使用[0]。只使用直接访问更容易/更易读。那说用xpath做的就是：

$nodes = $xml->xpath('//default_setup/connection');
if (count($nodes) > 0) {
  $conn = $nodes[0];
  $user = (string) $conn->username;
  $pass = (string) $conn->password;
}

来自我的导入程序的完整xml /连接代码，以防它有用：

// get path for config
$config = realpath(dirname(__FILE__) . '/../magento/app/etc/local.xml');

if (!$config) {
    // I've made a terrible mistake.
    throw new Exception('Could not load magento config.');
} else {
    // load up XML
    $conf = new SimpleXMLElement($config, LIBXML_NOCDATA, true);

    // pull the database connection config node
    $conn = $conf->global->resources->default_setup->connection;

    // create a DSN - we will worry about manually setting the attributes ourself
    // since this is a simple one off
    $dsn = sprintf('mysql:host=%s;dbname=%s', $conn->host, $conn->dbname);
    $user = (string) $conn->username;
    $pass = (string) $conn->password;
    $db = new PDO($dsn, $user, $pass);


    if (!$db instanceof PDO) {
        // WOMP, WOMP!
        throw new Exception('Could not create database connection!');
        exit;
    }
}

Answer 2

让我们远离您的问题以简化事情。这是一个例子。

xml文件，example.php：

<?php
$xmlstr = <<<XML
<?xml version='1.0' standalone='yes'?>
<movies>
 <movie>
  <title>PHP: Behind the Parser</title>
  <characters>
   <character>
    <name>Ms. Coder</name>
    <actor>Onlivia Actora</actor>
   </character>
   <character>
    <name>Mr. Coder</name>
    <actor>El Act&#211;r</actor>
   </character>
  </characters>
  <plot>
   So, this language. It's like, a programming language. Or is it a
   scripting language? All is revealed in this thrilling horror spoof
   of a documentary.
  </plot>
  <great-lines>
   <line>PHP solves all my web problems</line>
  </great-lines>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
</movies>
XML;
?>

用于提取情节的PHP代码，在您的情况下将是用户名：

示例＃2获取

<?php
include 'example.php';

$movies = new SimpleXMLElement($xmlstr);

echo $movies->movie[0]->plot;
?>

这来自：http://php.net/manual/en/simplexml.examples-basic.php

好吧，好吧，它发生了。

你可以试试这个，特殊值*匹配所有标签。

<?php
$xml = <<< XML
<?xml version="1.0" encoding="utf-8"?>
<books>
 <book>Patterns of Enterprise Application Architecture</book>
 <book>Design Patterns: Elements of Reusable Software Design</book>
 <book>Clean Code</book>
</books>
XML;

$dom = new DOMDocument;
$dom->loadXML($xml);
$books = $dom->getElementsByTagName('book');
foreach ($books as $book) {
    echo $book->nodeValue, PHP_EOL;
}
?>

试一试。这是来自php.net的网址：http://php.net/manual/en/domdocument.getelementsbytagname.php

如果你看下面还有更多的例子。

Simplexml PHP - 获得＆＃34;深度节点的价值＆＃34;

2 个答案: