在PHP中使用自定义DTD验证XML

看一看 PHP's DOM 尤其是 DOMDocument::schemaValidate 和 DOMDocument::validate .

DOMDocument::validate的示例相当简单:

<?php
$dom = new DOMDocument;
$dom->Load('book.xml');
if ($dom->validate()) {
    echo "This document is valid!\n";
}
?>

如果字符串中有dtd,则可以使用 data wrapper 对于dtd:

$xml = '<?xml version="1.0"?>
        <!DOCTYPE note SYSTEM "note.dtd">
        <note>
            <to>Tove</to>
            <from>Jani</from>
            <heading>Reminder</heading>
            <body>Don\'t forget me this weekend!</body>
        </note>';

$dtd = '<!ELEMENT note (to,from,heading,body)>
        <!ELEMENT to (#PCDATA)>
        <!ELEMENT from (#PCDATA)>
        <!ELEMENT heading (#PCDATA)>
        <!ELEMENT body (#PCDATA)>';


$root = 'note';

$systemId = 'data://text/plain;base64,'.base64_encode($dtd);

$old = new DOMDocument;
$old->loadXML($xml);

$creator = new DOMImplementation;
$doctype = $creator->createDocumentType($root, null, $systemId);
$new = $creator->createDocument(null, null, $doctype);
$new->encoding = "utf-8";

$oldNode = $old->getElementsByTagName($root)->item(0);
$newNode = $new->importNode($oldNode, true);
$new->appendChild($newNode);

if (@$new->validate()) {
    echo "Valid";
} else {
    echo "Not valid";
}

我对原始问题的解释是,我们有一个“机载”XML文件,我们想根据“机载”DTD文件对其进行验证。以下是我将如何实现Soren和PayamRWD在评论中表达的“在DOCTYPE元素内插入本地DTD”的想法:

public function validate($xml_realpath, $dtd_realpath=null) {
    $xml_lines = file($xml_realpath);
    $doc = new DOMDocument;
    if ($dtd_realpath) {
        // Inject DTD inside DOCTYPE line:
        $dtd_lines = file($dtd_realpath);
        $new_lines = array();
        foreach ($xml_lines as $x) {
            // Assume DOCTYPE SYSTEM "blah blah" format:
            if (preg_match('/DOCTYPE/', $x)) {
                $y = preg_replace('/SYSTEM "(.*)"/', " [\n" . implode("\n", $dtd_lines) . "\n]", $x);
                $new_lines[] = $y;
            } else {
                $new_lines[] = $x;
            }
        }
        $doc->loadXML(implode("\n", $new_lines));
    } else {
        $doc->loadXML(implode("\n", $xml_lines));
    }
    // Enable user error handling
    libxml_use_internal_errors(true);
    if (@$doc->validate()) {
        echo "Valid!\n";
    } else {
        echo "Not valid:\n";
        $errors = libxml_get_errors();
        foreach ($errors as $error) {
            print_r($error, true);
        }
    }
}

请注意,为了简洁起见,错误处理已被抑制,可能有更好/更通用的方法来处理插值。但我 有 实际上将此代码与真实数据一起使用,它适用于PHP 5.2.17版本。

试图完成“owenmashall”的答案:

在xml-validator.php中:

添加html、页眉、正文。..

<?php

$dom = new DOMDocument; <br/>
$dom->Load('template-format.xml');<br/>
if ($dom->validate()) { <br/>
    echo "This document is valid!\n"; <br/>
}

?>

template-format.xml:

<?xml version="1.0" encoding="utf-8"?>

<!-- DTD to Validate against (format example) -->

<!DOCTYPE template-format [  <br/>
  <!ELEMENT template-format (template)>  <br/>
  <!ELEMENT template (background-color, color, font-size, header-image)>  <br/>
  <!ELEMENT background-color   (#PCDATA)>  <br/>
  <!ELEMENT color (#PCDATA)>  <br/>
  <!ELEMENT font-size (#PCDATA)>  <br/>
  <!ELEMENT header-image (#PCDATA)>  <br/>
]>

<!-- XML example -->

<template-format>

<template>

<background-color>&lt;/background-color>  <br/>
<color>&lt;/color>  <br/>
<font-size>&lt;/font-size>  <br/>
<header-image>&lt;/header-image>  <br/>

</template> 

</template-format>