Description:
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I need to archive a lot (>1000 && <2000) of files into plenty small archives (~900) via PHP application. I used PharData class to create archives. During script run I recieved "failed to open dir: Too many open files" error. After debug my whole application I found that calling PharData::compress() open some /tmp file that is never closed. Calling compress() in a loop lead to rising count of open files. 


Test script:
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<?php

function archiveDir($archiveName, $dir)
{
    system("lsof -p ".getmypid()." | wc -l");  // on my local host give 72
    $arch = new \PharData($archiveName);
    $arch->buildFromDirectory($dir);
    system("lsof -p ".getmypid()." | wc -l"); // on my local host give 73 - buildFromDirectory open $dir
    system("lsof -p ".getmypid()." | grep /tmp/"); // empty result - no /tmp/ files open
    $arch->compress(\Phar::GZ);
    system("lsof -p ".getmypid()." | wc -l"); // on my local host give 74 - compress open /tmp/phppI7yJX file
}

archiveDir("./testArchive.tar", "./");
system("lsof -p ".getmypid()." | wc -l"); // on my local host give 73 - $dir opened by DirectoryIterator (line 7) is closed
system("lsof -p ".getmypid()." | grep /tmp/"); // we have still opened  /tmp/phppI7yJX file

Expected result:
----------------
Last lsof call should return same count of open files as first call of lsof.

Actual result:
--------------
lsof called after archiveDir() show, that we have one more open file than before archiveDir() call