Description:
------------
 - PHP shipped with Cygwin (7.0.19), can't find anything in the patch notes to suggest this is fixed in newer versions.

`PharData` seems to cache file contents even when the file is no longer on the disk. Constructing a new `PharData` with the same filename will produce the same object as before. I understand there is an alias parameter, but this seems like totally unexpected behaviour especially as these functions seem to be the go-to functions for extracting tar archives these days.

Looking in the source code I see that this seems to be partially deliberate behaviour as `phar_open_parsed_phar` tries to open an already existing phar file, however, if the file has been deleted off disk and a new `PharData` object is created then surely new data should be loaded? Also does this mean that once a PharData object is created and a tar file opened that the entire contents of the tar is held in memory for the duration of the PHP script?

There seems to be no way to remove this caching, as shown in the test script the tgz file is removed and then opened again with a new file (with different contents), and yet the same file is opened somehow.

I've tried calling `unset()` on the `PharData` object before creating a new one or calling `clearstatcache()`, but to no avail.

Interestingly and of note, even though the default format is `Phar::TAR`, it seems that it auto-detects TGZ files and decompresses them fine.

Test script:
---------------
<?php

$url = 'http://thrysoee.dk/editline/libedit-%s-3.1.tar.gz';
$downloadFile = '/tmp/foo.tgz';

file_put_contents($downloadFile, fopen(sprintf($url, '20170329'), 'r'));
var_dump(new PharData($downloadFile));

unlink($downloadFile);

file_put_contents($downloadFile, fopen(sprintf($url, '20160903'), 'r'));
var_dump(new PharData($downloadFile));

Expected result:
----------------
I expect the second object to be the new file, as shown in the edited output below:

/tmp $ php /tmp/phpbugtest.php
object(PharData)#1 (4) {
  ["pathName":"SplFileInfo":private]=>
  string(40) "phar:///tmp/foo.tgz/libedit-20170329-3.1"
  ["fileName":"SplFileInfo":private]=>
  string(20) "libedit-20170329-3.1"
  ["glob":"DirectoryIterator":private]=>
  bool(false)
  ["subPathName":"RecursiveDirectoryIterator":private]=>
  string(0) ""
}
object(PharData)#2 (4) {
  ["pathName":"SplFileInfo":private]=>
  string(40) "phar:///tmp/foo.tgz/libedit-20160603-3.1"
  ["fileName":"SplFileInfo":private]=>
  string(20) "libedit-20160603-3.1"
  ["glob":"DirectoryIterator":private]=>
  bool(false)
  ["subPathName":"RecursiveDirectoryIterator":private]=>
  string(0) ""
}

Actual result:
--------------
/tmp $ php /tmp/phpbugtest.php
object(PharData)#1 (4) {
  ["pathName":"SplFileInfo":private]=>
  string(40) "phar:///tmp/foo.tgz/libedit-20170329-3.1"
  ["fileName":"SplFileInfo":private]=>
  string(20) "libedit-20170329-3.1"
  ["glob":"DirectoryIterator":private]=>
  bool(false)
  ["subPathName":"RecursiveDirectoryIterator":private]=>
  string(0) ""
}
object(PharData)#1 (4) {
  ["pathName":"SplFileInfo":private]=>
  string(40) "phar:///tmp/foo.tgz/libedit-20170329-3.1"
  ["fileName":"SplFileInfo":private]=>
  string(20) "libedit-20170329-3.1"
  ["glob":"DirectoryIterator":private]=>
  bool(false)
  ["subPathName":"RecursiveDirectoryIterator":private]=>
  string(0) ""
}