How can encoding and decoding issues impact the parsing of XML files in PHP, and what steps can be taken to resolve them?

Encoding and decoding issues can impact the parsing of XML files in PHP by causing errors when reading or writing special characters. To resolve this, you can use functions like htmlspecialchars() to encode special characters before writing to an XML file, and htmlspecialchars_decode() to decode them when reading from the file.

// Encode special characters before writing to XML file
$encoded_data = htmlspecialchars($data, ENT_XML1);

// Decode special characters when reading from XML file
$decoded_data = htmlspecialchars_decode($encoded_data, ENT_XML1);