[PHP] Possible Bug in Packages/PHP/Snippets/php (begin tag).sublime-snippet

### Expected behavior In ST build 4200 on a Windows 10 x64 system, I was parsing snippet files with Python Package `xml.etree.ElementTree` and one of the shipped `.suplime-snippet` files causes an exception when parsing it as XML, namely this one: https://github.com/sublimehq/Packages/blob/master/PHP/Snippets/php%20(begin%20tag).sublime-snippet The reason is that the ampersand ('&') at character position 141 (inside the `<scope>` tag) is causing the `ET.fromstring(snippet_str)` to generate this exception: ``` xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 4, column 41 ``` I tested it by replacing that `&` with `&amp;` instead and that DOES parse without an exception. And the text parsed out of it is correct: ``` '(embedding.php | text.html.php) & punctuation.section.embedded.begin.php' ``` While this snippet does work in Sublime Text (producing a `<?php | ?>` result), I mention this because it MAY be more correct to replace that ampersand with the `&amp;` entity. I could find nothing specifically about this in either official or community docs. However, one example was given in the official docs that uses the `&lt;` and `&gt;` entities and so I suspect that is the correct way to include an ampersand in the scope as well? Anyway, I'm the type to "speak up" when I see something wrong. I hope this helps. Kind regards, Vic ### Actual behavior see above. ### Steps to reproduce In a plugin: ```py from xml.etree import ElementTree as ET import sublime path = 'Packages/PHP/Snippets/php (begin tag).sublime-snippet' snippet_xml_str = sublime.load_resource(path) snippet_tree = ET.fromstring(snippet_xml_str) Traceback (most recent call last): File "__main__", line 1, in <module> File "./python3.8/xml/etree/ElementTree.py", line 1320, in XML xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 4, column 41 ``` And proving the ampersand => `&amp;` resolves it: ```py left = snippet_xml_str[:141] right = snippet_xml_str[:142] new_str = left + '&amp;' + right snippet_tree = ET.fromstring(snippet_xml_str) scope = snippet_tree.find('scope').text print(scope) # produces: "(embedding.php | text.html.php) & punctuation.section.embedded.begin.php" ```