PHP ZipArchive not adding more than 700 files

I have a problem with the php_zip.dll's ZipArchive class. I'm using it through the ZipArchiveImproved wrapper class suggested on php.net to avoid the max file-handle issue.

The problem is really simple: 700 files are added properly (jpg image files), and the rest fails. The addFile method returns false.

The PHP version is 5.2.6.

The weird thing is that开发者_StackOverflow社区 this actually used to work.

What could be the problem? Can you give me any clues?

Thank you very much in advance!

Edit: sorry, it's not true that I'm not getting any error message (display_errors was switched off in php.ini I didn't notice it before). From the 701. file on, I'm getting the following error message:

Warning: ZipArchive::addFile() [ziparchive.addfile]: Invalid or unitialized Zip object in /.../includes/ZipArchiveImproved.class.php on line 104

Looks like the close() call returns false, but issues no error. Any ideas?

Edit 2: the relevant source:

include_once DIR_INCLUDES . 'ZipArchiveImproved.class.php';

ini_set('max_execution_time', 0);

$filePath = $_SESSION['fqm_archivePath'];

$zip = new ZipArchiveImproved();
if(! $zip->open($filePath, ZipArchive::CREATE))
{
    echo '<div class="error">Hiba: a célfájl a(z) "' . $filePath . '" útvonalon nem hozható létre.</div>';
    return;
}

echo('Starting (' . count($_POST['files']) . ' files)...<br>');

$addedDirs = array();
foreach($_POST['files'] as $i => $f)
{
    $d = getUserNameByPicPath($f);
    if(! isset($addedDirs[$d]))
    {
        $addedDirs[$d] = true;
        $zip->addEmptyDir($d);

        echo('Added dir "' . $d . '".<br>');
    }

    $addName = $d . '/' . basename($f);
    $r = $zip->addFile($f, $addName);
    if(! $r)
    {
        echo('<font color="Red">[' . ($i + 1) . '] Failed to add file "' . $f . '" as "' . $addName . '".</font><br>');
    }
}

$a = $zip->addFromString('test.txt', 'Moooo');
if($a)
{
    echo 'Added string successfully.<br>';
}
else
{
    echo 'Failed to add string.<br>';
}

$zip->close();

It's probably because of maximal number of open files in your OS (see http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/ for more detailed info; it can by system-wide or just user limit).

Zip keeps every added file open until Zip::close is called.

The solution is to close and reopen archive every X files (256 or 512 should be safe value).

The problem is described here: http://www.php.net/manual/en/function.ziparchive-open.php#88765

Have you tried to specify both flags?

I solved this problem by increasing the ulimit: ulimit -n 8192.