Add a static xml valid class

resources/classes/xml.php

@@ -17,4 +17,38 @@ class xml {
 		return htmlspecialchars($string, ENT_XML1);
 	}
 
+	/**
+	 * Tests the XML to determine if it is valid
+	 *
+	 * @param string $xml_string The XML string to be validated.
+	 *
+	 * @return array Return the xml_valid, and xml_errors. Valid is a boolean value, and errors return an array.
+	 */
+	static function valid($xml_string) {
+		//set the default value to true
+		$xml_valid = true;
+		$xml_errors = '';
+
+		//use the XML to check if it's valid
+		if (PHP_VERSION_ID < 80000) {
+			libxml_disable_entity_loader(true);
+		}
+
+		//enable internal error handling
+		libxml_use_internal_errors(true);
+
+		//load the XML object
+		$xml_object = simplexml_load_string($xml_string, 'SimpleXMLElement', LIBXML_NOCDATA);
+		if (!$xml_object) {
+			//set the xml_errors and the xml_valid boolean value
+			$xml_errors = libxml_get_errors();
+			$xml_valid = false;
+
+			//clear the libxml error buffer.
+			libxml_clear_errors();
+		}
+
+		//send the result
+		return ['valid' -> $xml_valid, 'errors' -> $xml_errors];
+	}
 }