(PECL ps >= 1.1.0)
ps_add_pdflink — Adds link to a page in a second pdf document
$psdoc
   , float $llx
   , float $lly
   , float $urx
   , float $ury
   , string $filename
   , int $page
   , string $dest
   )Places a hyperlink at the given position pointing to a second pdf document. Clicking on the link will branch to the document at the given page. The first page in a document has number 1.
   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.
filename
     The name of the pdf document to be opened when clicking on this link.
page
     The page number of the destination pdf document
dest
     
       The parameter dest determines how the document
       is being viewed. It can be fitpage,
       fitwidth, fitheight, or
       fitbbox.
      
   Returns TRUE on success or FALSE on failure.