supressing errors is really slow

[eluser]xwero[/eluser]
I've did a quick and dirty benchmark

Code:

$end = 10;
$this->benchmark->mark('dog');
for($i=0;$i<$end;$i++)
{
  $value = @$_POST['test'];
}
$this->benchmark->mark('cat');
for($i=0;$i<$end;$i++)
{
  $value = (isset($_POST['test']))?$_POST['test']:'';
}
$this->benchmark->mark('bird');
        
echo '@ time : '.$this->benchmark->elapsed_time('dog', 'cat').'<br>';
echo 'if time: '.$this->benchmark->elapsed_time('cat', 'bird').'<br>';

1 time result
@ time : 0.0001
if time: 0.0000

10 times result
@ time : 0.0003
if time: 0.0000

100 times result
@ time : 0.0023
if time: 0.0001

1000 times result
@ time : 0.0226
if time: 0.0014

There is quite some suppressing in CI's code so i start to wonder is it really necessary or is there alternative, faster code?