custom PHP function needed - imagettftext and imagettfbox modification

i'm looking for a custom function along the lines of the following: **function renderText($string,$font,$font_size=12,$width_limit=600,$line_limit=2,$base_spacing=0,$filename)** - standard GD functions will be used (imagettftext, imagettfbbox, etc) - $font is a path to a ttf font file - $width_limit is the maximum width of the image. line breaks will be added if necessary - $line_limit is the number of lines of text allowed - $base_spacing is the spacing between letters. 0 is default - $filename where the output file will be rendered - the function will render a png image and return true on success and false if it fails - if the text wraps to more lines than $line_limit allows, text will be adjusted to $line_limit number of lines, and the spacing between the letters will be lowered as little as possible (by 0.1) until it fits on $line_limit number of lines - this function is meant for small amounts of text, so it won't be necessary to try to cram what should be 10 lines of text into 2 lines.