Mysqldump create empty sql file? [php & mysql on Windows]

[huh]

I tried to dump a database:\[code\]<?php$dbhost = "localhost";$dbuser = "XXXX";$dbpass = "XXXXXXXX";$dbname = 'testdb';$list = shell_exec ("C:\wamp\bin\mysql\mysql5.1.33\bin\mysqldump.exe $dbname --user=$dbuser--password=$dbpass > dumpfile.sql");?>\[/code\]I tried both specified full path to mysqldump.exe or just use mysqldump, it still give me a 0kb dumpfile.sqlDetails: Programming Language: PHP Database: MySql 5.XX OS(server): Windows Server 2003. (currently testing on Windows Vista machine)EDIT @ Jeremy Heslop:I tried:\[code\]shell_exec("C:\wamp\bin\mysql\mysql5.1.33\bin\mysqldump.exe --opt -h $dbhost -u$dbuser -p$dbpass $dbname > test.sql");\[/code\]safe_mode = offStill no luck man.