php man page for pdf_add_pdflink

PDF_ADD_PDFLINK(3)							 1							PDF_ADD_PDFLINK(3)

PDF_add_pdflink - Add file link annotation for current page [deprecated]

SYNOPSIS
       bool  PDF_add_pdflink  (resource   $pdfdoc,  float   $bottom_left_x,  float  $bottom_left_y, float  $up_right_x, float  $up_right_y, string
       $filename, int  $page, string  $dest)

DESCRIPTION
	Add a file link annotation to a PDF target. Returns TRUE on success or FALSE on failure.

	This function is deprecated since PDFlib version 6, use PDF_create_action(3) with $type=GoToR and PDF_create_annotation(3) with $type=Link
       instead.

PHP Documentation Group 													PDF_ADD_PDFLINK(3)