I am using mod_php3-3.0.12-module-mysql-imap-gd.so with Apache 1.2.6
If I call get_browser() I get a segfault error logged to the apache error log.
I do not actually get a core file, and if I turn on php-logging I get nothing there as well.
I am setting my php config vars via the apache httpd.conf file like this:
  php3_browscap /usr/local/etc/httpd/browscap.ini
and I am using the latest file from cyscape.

One interesting note: if I comment out the browscap config variable get_browser() returns an empty array. If I put it in the segfaults every time.

I won't add a code listing since his bug is the virtually identical to bugs 970, 2348, 3016 and 3481.

I would urge someone to look at this one; this bug crosses all platforms and is reported as early as 3.0.5.
Parsing a file isn't really a brain-buster. Perhaps the browser.ini should be converted to XML and a quick parser library put in place?  Just a suggestion.  
If I was a C coder I would do it myself... if only it were Java.