PHP½âѹËõzipÎļþ

<?php
$zip_filename = "testpm.zip";
$zip_filename = key_exists('zip', $_GET) && $_GET['zip']?$_GET['zip']:$zip_filename;
$zip_filepath = str_replace('\\', '/', dirname(__FILE__)) . '/' . $zip_filename;
if(!is_file($zip_filepath))
{
    die('Îļþ"'.$zip_filepath.'"²»´æÔÚ!');
}
$zip = new ZipArchive();
$rs = $zip->open($zip_filepath);
if($rs !== TRUE)
{
    die('½âѹʧ°Ü!Error Code:'. $rs);
}
$zip->extractTo('./test/test1');
$zip->close();
echo $zip_filename.'½âѹ³É¹¦!';
?>