Description:
------------
php --rf zipArchive::addPattern tells us that the path is optional. This is 
confirmed by the parameter parsing.

But, at least on windows, if no path is supplied, with a pattern that will include 
everything, no files are added.

Setting the path to the current directory (for example) will include all files in 
that directory (using the same regex).



Test script:
---------------
<?php
$zip = new ZipArchive;

if (True === $zip->open('./TestAddPattern.zip', ZIPARCHIVE::CREATE)) {
  echo
  	'Add all files with no path param', PHP_EOL,
  	print_r($zip->addPattern('/.*/'), True), PHP_EOL,
  	'Number of files : ', $zip->numFiles, PHP_EOL,
  	'Add all files in current path param', PHP_EOL,
  	print_r($zip->addPattern('/.*/', '.'), True), PHP_EOL,
  	'Number of files : ', $zip->numFiles, PHP_EOL;
  $zip->close();
}

Expected result:
----------------
Add all files with no path param
Array
(
    [0] => .\25.BAT
...
    [88] => .\upxit.bat
)

Number of files : 89
Add all files in current path param
Array
(
    [0] => .\25.BAT
...
    [88] => .\upxit.bat
)

Number of files : 178


Actual result:
--------------
Add all files with no path param

Number of files : 0
Add all files in current path param
Array
(
    [0] => .\25.BAT
...
    [88] => .\upxit.bat
)

Number of files : 89