Description:
------------
When parameter is passed to oci_bind_array_by_name,
not only the parameter but all the arrays associated
with that parameter are changed after oci_execute . 

Arrays should be passed-by-value, not by-reference,
so this behaviour must be a bug.


Test script:
---------------
// ARRAYBINDPKG1 is describe in PHP manual
// http://jp.php.net/manual/en/function.oci-bind-array-by-name.php
// in Example section
// Example #1 oci_bind_array_by_name() example

$statement = oci_parse($c, "BEGIN ARRAYBINDPKG1.iobind(:c1); END;");

$array = array("one", "two", "three", "four", "five");
$tmp = $array; // should passed by value

oci_bind_array_by_name($statement, ":c1", $tmp, 5, -1, SQLT_CHR);

oci_execute($statement);

var_export($array); // should not be changed but changed 
var_export($tmp);

exit;

Expected result:
----------------
array (
  0 => 'one',
  1 => 'two',
  2 => 'three',
  3 => 'four',
  4 => 'five',
)

array (
  0 => '555',
  1 => '444',
  2 => '333',
  3 => '222',
  4 => '111',
)

Actual result:
--------------
array (
  0 => '555',
  1 => '444',
  2 => '333',
  3 => '222',
  4 => '111',
)

array (
  0 => '555',
  1 => '444',
  2 => '333',
  3 => '222',
  4 => '111',
)