Codeigniter error logging

[eluser]Unknown[/eluser]
I have set error threshold to 1 in config.php.

But the problem is that

i am getting many errors that is NOT ACTUALLY ERRORS in terms of application logic.

Consider the following code examples

Code:

$deleted = @unlink($filename);
$imap_uid = @imap_uid($con,$msgno);

As you can see that the above example will not throw errors, but codeigniter will log if an error occurred.

Is it possible to disable error logging dynamically ?

i am expecting something like this

Code:

// ....

   $this->error_log = 0; // disable error logging

   //Perform some operation that which may log an error,even its suppressed

   $this->error_log = 1; //enable it again

// ...

Thanks.