Description:
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I am using the class 'zipfile' I found from Zend.com to create zip files. It works well with files smaller than 1 megabyte in size.  But when I tried to zip a file larger than 1 mb, it doesn't produce the zip file.

Reproduce code:
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<?php require("ZipFile.inc.php"); #from Zend.com
                                                                                                                             $zipfile = new ZipFile();
$zipfile->add_dir("./");                                                                                                                                                                                                                                                
                                                                                                                             $file = "ATD34501-030705V.208.00"; #some file here..
$fp = fopen($file, "r");
$filedata = "";
if($fp) {
        $filedata = fread($fp, filesize($file));
        fclose($fp);
}
                                                                                                                             print "\nfile opened..\n";
                                                                                                                             $zipfile->add_file($filedata, basename($file));
                                                                                                                             print "\nfile added in zip..\n";
                                                                                                                             $ftpdir = "/var/ftp/pub/031105"; #ftp directory
$fname = "test.zip"; #zipfile name
                                                                                                                             $fp = fopen("$ftpdir/$fname", "w+");
if($fp) {
        fwrite($fp, $zipfile->file());
        fclose($fp);
}                                                                                                                              ?>

Expected result:
----------------
test.zip file

Actual result:
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no file created