oci_internal_debug() enables or disables internal debug output. Set onoff to 0 to turn debug output off or 1 to turn it on.
Note: In PHP versions before 5.0.0 you must use ociinternaldebug() instead. This name still can be used, it was left as alias of oci_internal_debug() for downwards compatability. This, however, is deprecated and not recommended.