How can errors such as "Extra content at the end of the document" be resolved when working with SimpleXML in PHP?

When working with SimpleXML in PHP, the error "Extra content at the end of the document" occurs when there is additional content after the XML document has been fully parsed. This can happen if there are whitespace characters, comments, or other content after the closing tag of the XML document. To resolve this issue, you can trim the input string to remove any extra content at the end before parsing it with SimpleXML.

// Example code to resolve "Extra content at the end of the document" error
$xmlString = "<data><name>John</name><age>30</age></data> ";
// Trim the input string to remove any extra content at the end
$xmlString = trim($xmlString);
$xml = simplexml_load_string($xmlString);
// Use $xml as needed