This may can't be exactly a bug, maybe you can consider it as a not implemented feature (I'm not sure about it).

Well, when I'm triying to handle error generated by any Interbase function, it doesn't work. When I try the same with a MySQL function all goes ok. I'm interested in show my own error messages but it's imposible to handle any error generated by Interbase function. I have tried with error_handling(0), with the @ operator before the function, putting error_handling to 0 and ~E_ALL in PHP.INI but Interbase function always returns it own error message.

For example I have this code in a object constructor:

$this->IBConnection = @ibase_connect($this->SQLEDatabase, $this->SQLEUser, $this->SQLEPass, 'NONE', '0', '3');
if (!$this->IBConnection)
   trigger_error("No se pudo conectar con la base de datos", E_USER_ERROR);

Then, it first shows me the default error message and then my own generated error message...