esaisijo

Hi, This is esai, I’m newbie in PHP .Now I'm learning yii framework..I want to decrease the top margin header in my pdf document ..From my side i made changes in tcpdf extension file...but it didn't take any effect in top margin size. How to change the pdf margin in yii framework . is there any other way to set the top margin header size? I want to change the margin height of only specific pdf document...