$host= 'localhost';
$user= 'xxx';
$pass= 'xxx';
$db= 'xxx';
system(sprintf(
'mysqldump --opt -h %s -u %s -p%s %s | gzip > %s/_dump.sql.gz',
$host,
$user,
$pass,
$db,
getenv('DOCUMENT_ROOT')."/backup"
));
echo 'DONE';
?>