PHP compressed file

<?php
$zip = new ZipArchive();
$filename = "/tmp/test112.zip";

if ($zip->open($filename, ZIPARCHIVE::CREATE)!==TRUE) {
    exit("cannot open <$filename>\n");
}
$basePath='/tmp/test';
if ($dh = opendir($basePath)){
    while (($file = readdir($dh)) !== false){
        if($file!='.' && $file!='..'){
            $zip->addFile( $basePath.'/'.$file);
        }
    }

}

$zip->addFromString("testfilephp.txt","#1 This is a test string added as testfilephp.txt.\n");
$zip->addFromString("testfilephp2.txt","#2 This is a test string added as testfilephp2.txt.\n");
$zip->addFile( "/tmp/test/t.php");
echo "numfiles: " . $zip->numFiles . "\n";
echo "status:" . $zip->status . "\n";
$zip->close();

This is just a layer of file directories traversed