Description:
------------
`printf` is inconsistent parsing the format string. Sometimes it throws a warning, and sometimes does not.

`printf` doesn't seem to like very much single `%` chars and gets crazy.

Depending on the arguments number, it will print something, or nothing.

Test script:
---------------
printf( '% % % %'); // or echo sprintf(...);
printf( '% % % %', 10);
printf( '% % % %', 10, 20);
printf( '% % % %', 10, 20, 30);
printf( '% % % %', 10, 20, 30, 40);
printf( '% % % %', 10, 20, 30, 40, 50);
// Another example:
printf( '% ## %d ## % ## %d ## %d', 10, 20, 30, 40, 50);


Expected result:
----------------
Throwing a warning at each call, or none at all. But not only sometimes.

Actual result:
--------------
php > printf( '% % % %');
PHP Warning:  printf(): Too few arguments in php shell code on line 1
php > printf( '% % % %', 10);
PHP Warning:  printf(): Too few arguments in php shell code on line 1
php > printf( '% % % %', 10, 20);
% %
php > printf( '% % % %', 10, 20, 30);
% %
php > printf( '% % % %', 10, 20, 30, 40);
% %
php > printf( '% % % %', 10, 20, 30, 40, 50);
% %
php > // Another example:
php > echo sprintf( '% ## %d ## % ## %d ## %d', 10, 20, 30, 40, 50);
# 20 ## # 40 ## 50