Tokenizer/PHP: add some missing tokens to the $knownLengths property

Not sure if it really makes a difference, but I noticed some tokens were missing from this array which could safely be added.

Author: jrfnl

src/Tokenizers/PHP.php

@@ -320,6 +320,7 @@ class PHP extends Tokenizer
         T_DOUBLE_ARROW             => 2,
         T_DOUBLE_COLON             => 2,
         T_ECHO                     => 4,
+        T_ELLIPSIS                 => 3,
         T_ELSE                     => 4,
         T_ELSEIF                   => 6,
         T_EMPTY                    => 5,
@@ -334,6 +335,7 @@ class PHP extends Tokenizer
         T_FILE                     => 8,
         T_FINAL                    => 5,
         T_FINALLY                  => 7,
+        T_FN                       => 2,
         T_FOR                      => 3,
         T_FOREACH                  => 7,
         T_FUNCTION                 => 8,