false positives with sprintf with sign specifier

[VasekPurchart]

I think the sign specifier throws off checking of the number of placeholders:

<?php

var_dump(sprintf('%+02d', 1));

Tested on 0.5.2:

 ------ --------------------------------------------------------- 
  Line   bootstrap.php                                            
 ------ --------------------------------------------------------- 
  3      Call to sprintf contains 0 placeholders, 1 value given.  
 ------ ---------------------------------------------------------

The sign specifier is part of the formatting options though, see the documentation:

An optional sign specifier that forces a sign (- or +) to be used on a number. By default, only the - sign is used on a number if it's negative. This specifier forces positive numbers to have the + sign attached as well.

[ondrejmirtes]

Thanks!

[VasekPurchart]

Fix verified on master, thanks :)