PHP script to restore a database into another empty database

PHP script to restore a database into another empty database

This question might seem a duplicate, However i tried all the examples to
restore my database but none seems to work for me. I am trying to run a
script that will restore my backup sql file to new database. I tried these
lines to restore my database, but none seem to work.
$mysql_host = 'localhost;
$mysql_username = 'my_username';
$mysql_password = 'somepassword';
$db_name = 'test_db';
$source = 'C:/wamp/www/my_folder/test_db.sql';
$conn = mysql_connect( $mysql_host, $mysql_username, $mysql_password )
or die('Error connecting to MySQL server: ' . mysql_error());
mysql_query("CREATE DATABASE $db_name", $conn ) or die('Error
connecting to MySQL server: ' . mysql_error());
restore_my_database( $mysql_host, $mysql_username, $mysql_password,
$db_name, $source );
function restore_my_database( $mysql_host, $mysql_username,
$mysql_password, $db_name, $source ) {
exec("mysql --opt -h $mysql_host -u $mysql_username -p
$mysql_password $db_name < $source");
}
I also tried in function restore_my_database following lines
$command = "mysqldump --opt -h $mysql_host -u $mysql_username -p
$mysql_password $db_name > $source";
system($command);
Upto database create, the code is working fine, but restore is not
working. Can any one help me with the php restore code to restore my
database. Thanks in advance