Rollback is not working in PhpMyAdmin MySQL

Once I had problem, in rollback my changes in  MySQL.
I tried disabling autocomit. But problem was not resolved.

/* disable autocommit */
$mysqli->autocommit(FALSE);

$mysqli->rollback();
mysql_query("ROLLBACK");


Then finally, I found the actual problem.
By default in PhpMyadmin table type is MyISAM. Rollback will not work in MyISAM.

Then I changed the table in to InnoDB, It worked!!!