With PHP 5.6, oci_internal_debug() is a no-op, as documented on http://php.net/manual/de/migration56.extensions.php
(PHP 5, PHP 7, PECL OCI8 >= 1.1.0)
oci_internal_debug — Enables or disables internal debug output
$onoff
)Enables or disables internal debug output.
onoff
Set this to FALSE to turn debug output off or TRUE to turn it on.
No value is returned.
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.
With PHP 5.6, oci_internal_debug() is a no-op, as documented on http://php.net/manual/de/migration56.extensions.php