Noticed that strange files were being created in / (well,
in / of our chroot jail) whenever Apache restarted with
apachectl or SIGUSR1. Files often had unprintable characters in their four-letter filenames, and contained

[07-Dec-2000 11:54:34] PHP Warning:  Unable to load dynamic library './imap.so' - dlopen: cannot load ./imap.so in Unknown on line 0
[07-Dec-2000 11:54:34] PHP Warning:  Unable to load dynamic library './pgsql.so' - dlopen: cannot load ./pgsql.so in Unknown on line 0

(with appropriate date stamp, of course). BUT THEN: Last time this happened, we started looking around a little more, and found that our php.ini had been modified at a time in which no-one should have been modifying it; there *was* an Apache restart at that time, and PHP logged the above errors *into php.ini*!

This screams dangling-pointer to me, but I wouldn't know where to start to actually *fix* it, alas. 

PHP configured thusly:

 ./configure                                                \
       --without-gd                                         \
       --without-mysql                                      \
       --prefix=/pubmail/apache                             \
       --with-config-file-path=/pubmail/apache/conf         \
       --with-apache=/local/pkg/apache.webmail/apache-1.3.6 \
       --with-imap=/local/pkg/imap/imap-4.7c                \
  --with-pgsql=/pubmail/local/pkg/postgresql/root-postgresql-7.0.2


Select parts of php.ini:
error_reporting =       E_ALL & ~E_NOTICE
display_errors  =       On
log_errors              =       On
track_errors    =       Off
;error_prepend_string = "<font color=ff0000>"
;error_append_string = "</font>"
error_log       =       /apache/logs/php_errors.log
warn_plus_overloading   =       Off             ; warn if the + operator is used with strings

Other than the arbitrary file, PHP also logs its errors to the Apache error_log. It *doesn't* log to /apache/logs/php_errors.log, though.