Failing test regarding ORA-24816, php 7 and CLOB

[soyuka]

Ref bug discovery #2386
Ref php bug https://bugs.php.net/bug.php?id=72524

Because @deeky666 just had the right words for this issue, I'm quoting him:

There seems to be a difference between PHP5 and PHP7 in oci8 when binding NULL values to LONG/LOB type columns.
In PHP5 it was possible to execute the following INSERT statement without any error (sample):

INSERT INTO mytable VALUES (:clob_col, :varchar2_col)

If the value bound to parameter :varchar2_col is NULL, the following error is triggered (no matter what value the parameter :clob_col is bound to):

ORA-24816: Expanded non LONG bind data supplied after actual LONG or LOB column

If you switch the parameter order and both parameter values are bound to NULL, the same error occurs:

INSERT INTO mytable VALUES (:varchar2_col, :clob_col)

So no matter what order, not matter what value is bound to :clob_col, if :varchar2_col is bound to NULL, the error occurs.
If you have only one VARCHAR2 column or two (without a CLOB column) there also is no error.

This Pull request adds a test case for this scenario by using the DBAL, it's obviously failing for now.

[deeky666]

@soyuka thanks for your investigation and help. Much appreciated!

[soyuka]

@deeky666 It was a pleasure, thanks to you for contributing to the investigation!

[deeky666]

Handled in #2434.