Apache 1.3.12 with SSL
PHP 4.0 RC 1
Zend Optimizer

PDFLIB 3.0 compiled in using :
'./configure' '--with-mysql' '--with-apache=../apache_1.3.12' '--with-pdflib=/' '--with-zlib-dir' '--with-jpeg-dir=/usr/lib' '--with-tiff-dir=/usr/lib' '--with-png-dir=/usr/lib' '--with-gettext=/usr/bin' '--disable-debug' '--with-imap=../imap-4.7b' '--with-ttf' '--enable-trans-sid' '--prefix=/usr' '--exec-prefix=/usr'

Now .. if I try to set "compatibility" to "1.2" using the
pdf_set_parameter function after pdf_open, PdfLib says :
Internal pdflib error: Must change compatiblity level before PDF_open()
.. which obviously doesn't work since the pdf_set_parameter
function needs a pdf handle.

Ok .. trying to use pdf_getinfo first doesn't work :
Call to undefined function: pdf_get_info()
.. obviously since this is pdflib 3.0 (re the php manual)

A bit of code :
$name=tempname("/tmp/","");
$fp=fopen($name,"w");
$pdf=PDF_open($fp);
$info=PDF_get_info($pdf); /* Call to undefined function */
PDF_set_parameter($pdf,"compatibility","1.2"); /* Must change compatibility level before PDF_open */