Thanks, Brian
My env_whitelist just has two lines: ORACLE_HOME, TNS_ADMIN, to allow PHP to connect to Oracle DB's.
Example data taken from the end of two phpinfo()'s: apache-2.2.6: _ENV["TERM"] Eterm _ENV["SHELL"] /bin/bash _ENV["DEFAULTLEVEL"] default _ENV["USER"] root _ENV["TNS_ADMIN"] /usr/local/lib/oracle/network/admin_ENV["PATH"] /bin:/sbin:/usr/bin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/3.4.6:/usr/i386-pc-linux-gnu/gcc-bin/3.4.4
_ENV["PWD"] /etc/init.d _ENV["BOOTLEVEL"] boot _ENV["SVCNAME"] apache2 _ENV["CONSOLETYPE"] pty _ENV["SHLVL"] 1 _ENV["HOME"] /root _ENV["SOFTLEVEL"] default _ENV["ORACLE_HOME"] /usr/lib/oracle/10.2.0.3/client _ENV["_"] /sbin/start-stop-daemon apache-2.0.58-r2:_ENV["PATH"] /bin:/sbin:/usr/bin:/usr/sbin:/usr/local/sbin:/home/bpkroth/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/3.4.6:/usr/i386-pc-linux-gnu/gcc-bin/3.4.4:/usr/sbin:/sbin:/usr/local/sbin
_ENV["ORACLE_HOME"] /usr/lib/oracle/10.2.0.3/client _ENV["TNS_ADMIN"] no value
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