使用 PHP 向子节点 XML 添加属性

Question

我正在努力在具有静态唯一 ID 的 XML 文件中附加一个子节点。

我正在使用的 XML 提要托管在其他地方的服务器上，只能通过其 URL 访问。

所说的提要遵循这种模式：

<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>

我想要实现的是使用提要中的 URL 将唯一 id 添加到“属性”节点并在备用 URL 处输出 XML 提要。

例如example.com/proeprty-feed 包含没有 ID 的提要。使用 PHP 添加 ID 并将提要输出到 something.com/property-feed

<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property upid=123456>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property upid=abcdef>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>

我试过的是input.php

<?php
$xmlstr = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>
XML;
?>

还有output.php

<?php

include 'input.php';

$sxe = new SimpleXMLElement($xmlstr);
$sxe->addAttribute('upid', uniqid('prop-'));

echo $sxe->asXML();

?>

但是这个输出：

<properties upid="prop-5ac7c06a39ddd">
    <property>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>

Answer 1

类似这样的事情：

<?php

$string = '<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>';
$xml = new SimpleXMLElement($string);

for($i = 0; $i < count($xml -> property); $i++) {
    $xml -> property[$i] -> addAttribute('upid', uniqid());
}
header('Content-Type: text/xml');
print $xml -> asXml();

Answer 2

<?php
$xml = '<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property>
        <title>Some Sunny Place</title>
        <address>Some Building, Somewhere, Really Nice</address>
    </property>
    <property>
        <title>Some Rainy PLace Place</title>
        <address>Some Gutter, Somewhere, Not So Nice</address>
    </property>
</properties>';

$length = strlen('<property>');

while ($pos = strpos($xml, '<property>')) {
    $xml = substr_replace($xml, '<property upid=' . uniqid() . '>', $pos, $length);
    usleep(10); // Necessary so uniqid() is unique every iteration, it's kind of a hack not sure if it's the best solution
}

var_dump($xml);