Correct nullable types

Author: jdpanderson

src/Vectorface/MySQLite/MySQLite.php

@@ -53,7 +53,7 @@ function ($f) {
      * @param string[] $fnList A list of functions to create on the SQLite database. (Omit to create all.)
      * @return PDO Returns a reference to the PDO instance passed in to the function.
      */
-    public static function &createFunctions(PDO &$pdo, array $fnList = null)
+    public static function &createFunctions(PDO &$pdo, ?array $fnList = null)
     {
         if ($pdo->getAttribute(PDO::ATTR_DRIVER_NAME) !== 'sqlite') {
             throw new InvalidArgumentException('Expecting a PDO instance using the SQLite driver');
@@ -97,7 +97,7 @@ protected static function getPublicMethodData()
      * @param string[] $fnList A list of functions to create on the SQLite database, or empty for all.
      * @return bool Returns true if the method was registed. False otherwise.
      */
-    protected static function registerMethod(PDO &$pdo, $method, $paramCount, array $fnList = null)
+    protected static function registerMethod(PDO &$pdo, $method, $paramCount, ?array $fnList = null)
     {
         $function = substr($method, 6); /* Strip 'mysql_' prefix to get the function name. */