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(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.
  
此说明在文档被打印或显示时不可见,只在文档用 Acrobat Distiller 或 Ghostview 转换成 PDF 时显示。
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.
      
   成功时返回  TRUE , 或者在失败时返回  FALSE 。