如何阻止PHP DOM自动转义字符引用？

Question

...or how to do it another way?

I'm creating a select box using DOMDocument .

$field = $this->dom->createElement('select');
$optgroup = $this->dom->createElement('optgroup');

foreach($options as $v) {
   $option = $this->dom->createElement('option');
   $option->setAttribute('value', $v);
   $option->appendChild($this->dom->createTextNode($v));

   $optgroup->appendChild($option);
}

$field->appendChild($optgroup);

Where $options is an array of character references pre-loaded from an icon font:

array('!', '"', '#', '$', ...);

I need my output to look like this:

<select>
  <optgroup>
    <option value="&#33;">&#33;</option>
    <option value="&#34;">&#34;</option>
    <option value="&#35;">&#35;</option>
    ...
  </optgroup>
</select>

However, using the DOM methods, it auto escapes all the character references:

<option value="&amp;#33;">&amp;#33;</option>

How can I prevent that from happening?

NOTE: createEntityReference does not work for this as that method only supports entity references and not character references. Using it causes a fatal error for 'Invalid character error'.

Answer 1

Try a documentFragment instead, and stuff in some pre-made HTML:

$frag = $dom->createDocumentFragment();
$frag->loadHTML('<option value="&#33;">&#33;</option>');

$dom->appendChild($frag);

DOM is handy for manipulating an existing tree, but it's an incredible PAIN to build a new tree using nothing but DOM operations. Sometime's it's just easier to build your html/xml with plain string operations and then shove the whole string into DOM in one operation.