Php output pdf

I used f00001.6 to output pdf files in php. how can I add underscores to the specified text? Example: Name, Cell (floatw [, floath [, stringtxt [, mixedborder [, intln [, stringalign [, I php output pdf problem
I use f00001.6. how do I add underscores to the specified text? Example: name

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Cell (float w [, float h [, string txt [, mixed border [, int ln [, string align [, int fill [, mixed link])


Border
If you want to display a border around the edge of the bucket, the following values are available:
0: No Border
1: Border
Or contain some or all of the following strings (under any instructions ):
L: left edge
T: top edge
R: right edge
B: bottom edge
The default value is 0.