(PECL ps >= 1.1.0)
ps_add_weblink — Adds link to a web location
$psdoc
   , float $llx
   , float $lly
   , float $urx
   , float $ury
   , string $url
   )
   Places a hyperlink at the given position pointing to a web page. The 
   hyperlink's source position is a rectangle with its lower left corner at
   (llx, lly) and
   its upper right corner at (urx,
   ury). The rectangle has by default a thin
   blue border.
  
The note will not be visible if the document is printed or viewed but it will show up if the document is converted to pdf by either Acrobat Distillerâ„¢ or Ghostview.
psdoc
     Resource identifier of the postscript file as returned by ps_new().
llx
     The x-coordinate of the lower left corner.
lly
     The y-coordinate of the lower left corner.
urx
     The x-coordinate of the upper right corner.
ury
     The y-coordinate of the upper right corner.
url
     The url of the hyperlink to be opened when clicking on this link, e.g. http://www.php.net.
   Returns TRUE on success or FALSE on failure.