mailbox.php3 function not defined solution

[Wolfgang Buech]

Hello,
opening mailbox by clicking imp, you get the error messaage :
"Fatal error: Call to undefined function: page_open()"
The solution is as far as I found out, to edit your php.ini in
/etc/php.ini and ad the path  for example
/usr/local/httpd/php/prepend.php3 where your prepend.php3 file is to be
found.

; Automatically add files before or after any PHP document.
auto_prepend_file = /usr/local/httpd/php/prepend.php3
auto_append_file =

At least in my configuration that worked!
Don't forget to restart your apache webserver to apply changes!
http://yourwebserversurl/horde/test.php3 will give you a positve
response
Section: PHPLIB Configuration
PHPLIB (is page_open() defined):  Yes