Add use function for micro performance optimization

src/Action.php

@@ -1,6 +1,20 @@
 <?php
+
 namespace Teto\Routing;
 
+use function array_diff;
+use function array_fill_keys;
+use function array_filter;
+use function array_keys;
+use function array_values;
+use function count;
+use function explode;
+use function in_array;
+use function preg_match;
+use function strlen;
+use function strpos;
+use function substr;
+
 /**
  * Action object
  *

src/CommonPrefixTrieRouter.php

@@ -2,6 +2,11 @@
 
 namespace Teto\Routing;
 
+use function ord;
+use function strlen;
+use function substr;
+use function sprintf;
+
 /**
  * 共通接頭辞木構造を連想配列で実装したRouter
  *

src/Router.php

@@ -2,6 +2,15 @@
 
 namespace Teto\Routing;
 
+use function array_filter;
+use function array_shift;
+use function array_values;
+use function count;
+use function explode;
+use function implode;
+use function is_numeric;
+use function strpos;
+
 /**
  * Router
  *