I was having very strange issues with gettext only setting the locale once per Apache process (non-threaded), until I found this bug report:
http://bugs.php.net/bug.php?id=21965
It almost seemed like gettext was caching the data once per process, but in fact calling textdomain() fixed the issue for me.
textdomain
Description
string textdomain ( string text_domain)This function sets the domain to search within when calls are made to gettext(), usually the named after an application. The previous default domain is returned. Call it with NULL as parameter to get the current setting without changing it.
textdomain
ipso at snappymail dot ca
27-Apr-2007 11:26
27-Apr-2007 11:26
vke at onebox dot com
15-Mar-2002 06:07
15-Mar-2002 06:07
A domain is something like a word dictionary which is acting like a translation table.
