Update RParser.php

Parle/RParser.php

@@ -146,10 +146,10 @@ class RParser
      * This method is equivalent to the pseudo variable functionality in Bison.
      *
      * @link https://php.net/manual/en/parle-rparser.sigil.php
-     * @param array $idx Match index, zero based. [ int $idx ]
+     * @param int $idx Match index, zero based.
      * @return string Returns a string with the matched part.
      */
-    public function sigil(array $idx) : string {}
+    public function sigil(int $idx) : string {}
 
     /**
      * Declare a token
@@ -196,4 +196,4 @@ class RParser
      * @return bool Returns boolean witnessing whether the input chimes or not with the defined rules.
      */
     public function validate(string $data, Lexer $lexer) : bool {}
-}
+}