php - TCPDF Adding Margin on Write Function -

using tcpdf library, attempting center text right margin.

so basically, take whole width minus 0.25 inches , center text based off of that. tcpdf library provides documentation not provide information on how set margin on write() function.

write( $h, $txt, $link = '', $fill = false, $align = '', $ln = false, $stretch = 0, $firstline = false, $firstblock = false, $maxh = 0, $wadj = 0, $margin = '' ) 

here current code writing text:

$pdf->write(4.5, 'sample text', '', false, 'c', false, 1, false, false, 0, 0, array(0, 0, 0.25, 0)); 

this myself assuming margin array (top, left, right, bottom).

so, how set margins on text in write() function while having text centered still?