Description:
------------
The ibase_affected_rows function has one optional parameter which it's a resource link to a Interbase/Firebird database.

If we pass a non-resource link to this function it generates a Segmentation Fault

Test script:
---------------
// Bad parameter in ibase_affected_rows

$conx = ibase_connect($bd_file, $bd_user, $bd_pass, 'NONE');
$sql = 'UPDATE some_table SET some_field = ? WHERE some_id = xx';
$prep = ibase_prepare( $sql );		
$query = ibase_execute( $prep, $field_value);
if (ibase_affected_rows($query) != 1) ) {
echo "ok"
} else {
echo "error";
}

// Correct way
$conx = ibase_connect($bd_file, $bd_user, $bd_pass, 'NONE');
$sql = 'UPDATE some_table SET some_field = ? WHERE some_id = xx';
$prep = ibase_prepare( $sql );		
$query = ibase_execute( $prep, $field_value);
if (ibase_affected_rows($conx) != 1) ) {
echo "ok"
} else {
echo "error";
}

Expected result:
----------------
PHP should check if the passed variable it's a resource link, and in case it's not, it should generate one error, instead of a segmentation fault which gives no information to the developer for fix the problem.