Is active record more safer than PDO?

[eluser]Unknown[/eluser]
I have recently chosed computer science as my course in college and php is a little bit new to me....

I am using codeigniter for my various projects but i wanted to ask is, is active record as secured as PDO query? Or binding in simple queries in CI is on safer side?

If this question has been previously answered, a link to the thread will be greatly appreciated.