使用DOMDocument解析布尔属性 [英] Parse boolean attributes with DOMDocument

问题描述

我正在尝试使用最小化的布尔属性解析一个简单的配置文件，而DOMDocument没有它。我正在尝试加载以下内容：

I am trying to parse a simple config file with minimized Boolean attributes and the DOMDocument is not having it. I am trying to load the following:

<config>
    <text id='name' required>
        <label>Name:</label>
    </text>
</config>

具有以下代码

$dom = new DOMDocument();
$dom->preserveWhiteSpace=FALSE;
if($dom->LoadXML($template) === FALSE){
    throw new Exception("Could not parse template");
}

我收到警告

Warning: DOMDocument::loadXML(): Specification mandate value for attribute required in Entity, line: 2

我是否缺少标志或获取DOMDocument来解析最小布尔属性的内容？

Am I missing a flag or something to get DOMDocument to parse the minimum boolean attribute?

推荐答案

没有值的属性在 XML 1.0 或 1.1 ，因此您拥有不是XML。

An attribute without a value is not valid syntax in either XML 1.0 or 1.1, so what you have isn't XML. You should get that fixed.

假装不可能，您可以 使用：

Pretending that's not possible, you can use:

$dom->loadHTML($template, LIBXML_HTML_NODEFDTD | LIBXML_HTML_NOIMPLIED);

而是使用更宽容的解析模式，但是您会收到有关无效HTML的警告标签。因此，您还需要 libxml_use_internal_errors（true ） 和 libxml_get_errors（） （无论如何，您都应该使用它来处理错误），并忽略任何错误代码为 801 。

instead, which uses a parsing mode that's much more forgiving, but you'll get warnings about invalid HTML tags. So you'll also need libxml_use_internal_errors(true) and libxml_get_errors() (which you should probably be using anyway to deal with errors) and ignore anything with an error code of 801.

$notxml = <<<'XML'
<config>
    <text id='name' required>
        <label>Name:</label>
    </text>
</config>
XML;

libxml_use_internal_errors(true);
$dom = new DOMDocument();
$dom->loadHTML($notxml, LIBXML_HTML_NODEFDTD | LIBXML_HTML_NOIMPLIED);

foreach (libxml_get_errors() as $error) {
    // Ignore unknown tag errors
    if ($error->code === 801) continue;

    throw new Exception("Could not parse template");
}
libxml_clear_errors();

// do your stuff if everything didn't go completely awry

echo $dom->saveHTML(); // Just to prove it worked

输出：

Outputs:

<config>
    <text id="name" required>
        <label>Name:</label>
    </text>
</config>

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