Description:
------------
When creating a Phar archive with a very simple Phar::createFromDirectory() call 
(see test script) the generated archive is corrupt sometimes, depending on the 
contents packed into the Phar.

I CAN PROVIDE THE TEST CONTENTS TO A DEVELOPER BUT NOT TO THE PUBLIC.

Opening the Phar will cause a Fatal error. Adding an additional empty file (see 
test script) to the archive fixes the problem. Sometimes a second empty file has 
to be added, sometimes a third one.

Tested PHP versions:
- 5.3.26
- 5.4.16
- 5.5.0 RC3

Configure line (all versions):
'./configure'  
'--prefix=/opt/php/bin/php-5.3.26' 
'--with-gd' 
'--with-ldap=/usr' 
'--with-mysql' 
'--with-mssql' 
'--with-pdo-mysql' 
'--with-pdo-dblib' 
'--with-pdo-pgsql' 
'--with-pgsql' 
'--with-config-file-path=/opt/php/bin/php-5.3.26/etc' 
'--enable-mbstring' 
'--with-mcrypt' 
'--with-openssl' 
'--with-curl'
'--with-zlib' 
'--with-libdir=lib/x86_64-linux-gnu' 
'--with-jpeg-dir' 
'--with-png-dir'

Test script:
---------------
// Corrupt
$phar = new Phar("test.phar");
$phar->buildFromDirectory("content");
$phar->compress(Phar::GZ);

// Working (only difference is adding the empty file)
$phar = new Phar("test.phar");
$phar->buildFromDirectory("content");
$phar->addFromString("an-empty-file", "");
$phar->compress(Phar::GZ);

Expected result:
----------------
Working phar archive which can be opened with "new Phar('test.phar')".

Actual result:
--------------
Fatal error: Uncaught exception 'UnexpectedValueException' with message 'internal 
corruption of phar "/tmp/test/test.phar" (truncated manifest at stub end)'