Php 当文本同时包含“XML”和“XML”时，将文本转换为有效XML的健壮方法&；引用&引用；及&；nbsp&引用；

从中，我知道什么XML不能保存

因此，如果我有以下文本

$now = <<<'NOW'
<p><span data-farm="{&quot;animal&quot;:[&quot;dog&quot;]}">Hi &nbsp;</span></p>
NOW;

我会得到

PHP Warning:  DOMDocument::loadXML(): attributes construct error in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Couldn't find end of Start Tag span line 1 in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Opening and ending tag mismatch: p line 1 and span in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Opening and ending tag mismatch: zoo-root line 1 and p in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Extra content at the end of the document in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
Not valid XML

原因是，在

html\u entity\u decode

和

utf8\u encode

之后，我们将得到

<p><span data-farm="{"animal":["dog"]}">Hi  </span></p>

你好

我尝试了我知道的最后一种方法

方法3-字符串替换

$xml=new\DOMDocument（）；
if（！$xml->loadXML（“”.str_替换（“”， ；’，$now）。“”））{
打印“无效的XML\n”；
}否则{
打印“有效的XML\n”；
}

---

似乎有效。但是，方法3解决方案足够健壮吗？

您的文本看起来非常像HTML，并且处理得很好

例子：

$now=loadXML（$doctype.'.$now.'）；
echo$dom->saveXML（$dom->documentElement）；

输出：

你好

PHP Warning:  DOMDocument::loadXML(): attributes construct error in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Couldn't find end of Start Tag span line 1 in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Opening and ending tag mismatch: p line 1 and span in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Opening and ending tag mismatch: zoo-root line 1 and p in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
PHP Warning:  DOMDocument::loadXML(): Extra content at the end of the document in Entity, line: 1 in /home/cheok/Desktop/test.php on line 17
Not valid XML

<p><span data-farm="{"animal":["dog"]}">Hi  </span></p>

$xml = new \DOMDocument();
if (!$xml->loadXML('<zoo-root>' . str_replace('&nbsp;', '&#160;', $now) . '</zoo-root>')) {
    print "Not valid XML\n";
} else {
    print "Valid XML\n";
}

$now = <<<'NOW'
<p><span data-farm="{&quot;animal&quot;:[&quot;dog&quot;]}">Hi &nbsp;</span></p>
NOW;

$dom = new DOMDocument();
$dom->loadHTML($now, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
echo $dom->saveHTML();

<p><span data-farm='{"animal":["dog"]}'>Hi &nbsp;</span></p>

$now = <<<'NOW'
<p><span data-farm="{&quot;animal&quot;:[&quot;dog&quot;]}">Hi &nbsp;</span></p>
NOW;

$doctype = '<!DOCTYPE zoo-root [<!ENTITY nbsp "&#160;">]>';
$dom = new DOMDocument();
$dom->substituteEntities = true; // Not required, just for demonstration.
$dom->loadXML($doctype . '<zoo-root>' . $now . '</zoo-root>');
echo $dom->saveXML($dom->documentElement);

<zoo-root><p><span data-farm="{&quot;animal&quot;:[&quot;dog&quot;]}">Hi  </span></p></zoo-root>