( string username, string password [, string db [, string charset [, int session_mode]]] )
oci_pconnect() creates a persistent connection
to an Oracle server and logs on. Persistent connections are cached
and re-used between requests, resulting in reduced overhead on each
page load; a typical PHP application will have a single persistent
connection open against an Oracle server per Apache child process
(or PHP FastCGI/CGI process). See the Persistent Database
Connections section for more information.
The optional third parameter can either contain
the name of the local Oracle instance or the name of the entry in
tnsnames.ora. If the third parameter is not specified,
PHP uses environment variables ORACLE_SID and
TWO_TASK to determine the name of local Oracle
instance and location of tnsnames.ora accordingly.
Parameter session_mode is available since version
1.1 and accepts the following values: OCI_DEFAULT,
OCI_SYSOPER and OCI_SYSDBA.
If either OCI_SYSOPER or
OCI_SYSDBA were specified,
oci_connect() will try to establish privileged
connection using external credentials. Privileged connections are
disabled by default. To enable them you need to set oci8.privileged_connect
Using Oracle server version 9.2 and greater, you can
indicate charset parameter, which will be used in the new
connection. If you're using Oracle server < 9.2, this parameter will be ignored
and NLS_LANG environment variable will be used instead.
oci_pconnect() returns connection identifier or
FALSE on error.
In PHP versions before 5.0.0 you must use ociplogon() instead.
This name still can be used, it was left as alias of
oci_pconnect() for downwards compatability.
This, however, is deprecated and not recommended.
See also oci_connect() and