What are the potential pitfalls of not including a root tag in an XML file when using SimpleXML in PHP?

Without including a root tag in an XML file when using SimpleXML in PHP, the parser may not be able to properly read the XML structure, leading to errors or unexpected behavior. To solve this issue, always ensure that your XML file has a root tag that encapsulates the entire document.

$xmlString = '<data><name>John</name><age>30</age></data>';
$xml = simplexml_load_string('<root>' . $xmlString . '</root>');