(PHP 4 >= 4.0.5, PECL pdflib >= 1.0.0)
PDF_concat — Concatenate a matrix to the CTM
$p
   , float $a
   , float $b
   , float $c
   , float $d
   , float $e
   , float $f
   )
   Concatenates a matrix to the current transformation matrix (CTM). Returns TRUE on success or FALSE on failure.