Description:
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I find warnings that occurres each about 1 or 3 days.
The warning says,
PHP warning:  ocilogon() function.ocilogon OCIEnvNlsCreate() failed. There is something wrong with your system - please check that LD_LIBRARY_PATH includes the directory with Oracle Instant Client libraries.... 

But the LD_LIBRARY_PATH, the arguments to ocilogon() are all correct.

The warning continues 5 or 15 minutes, but no all ocilogon() fails.
Some ocilogon() fails, Others not fail in the same period.
I change ocilogon() to oci_connect(), but the warning also returns.

I could not find the warning when I use the Oracle Instant Client 9.2.0.5 and php 4.3.8, but I find now the message.
I use now the Oracle Instant Client 10.2.0.3 and php 5.2.8 pair.

I doubt OCI_G(errcode) may return error rarely in spite of correct arguments.
The OCI_G(errcode) is at 1237 line in /ext/oci8/oci8.c .

OCI_G(errcode) seems to use Oracle API at 446 line in /ext/oci8/php_oci8_int.h .

Reproduce code:
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$ID = "userid";
$PW = "userpass";
$DB = "(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=userhost)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=usersrvname)))";
return OCILogon($ID, $PW, $DB);