Fix undefined variable/wrong parameter count/unknown functions

src/Util/Lock.php

@@ -64,7 +64,7 @@ class Lock
 		$file = $temp.'/'.$fn_name.'.sem';
 
 		if (!file_exists($file)) {
-			file_put_contents($file, $function);
+			file_put_contents($file, $fn_name);
 		}
 
 		return ftok($file, 'f');

src/Util/XML.php

@@ -292,11 +292,11 @@ class XML
 		// Go through the tags.
 		$repeated_tag_index = array(); // Multiple tags with same name will be turned into an array
 		foreach ($xml_values as $data) {
-			unset($attributes, $value); // Remove existing values, or there will be trouble
-
-			// This command will extract these variables into the foreach scope
-			// tag(string), type(string), level(int), attributes(array).
-			extract($data); // We could use the array by itself, but this cooler.
+			$tag        = $data['tag'];
+			$type       = $data['type'];
+			$level      = $data['level'];
+			$attributes = isset($data['attributes']) ? $data['attributes'] : null;
+			$value      = isset($data['value']) ? $data['value'] : null;
 
 			$result = array();
 			$attributes_data = array();