How To Get Last segment From URL In Codeigniter?

I need to get the value of last URI / URL segment in Codeigniter today and I came up with this easy solutions. It permits you to retrieve a last segment from the URI. ALL three alternative works like charm.
Alternative 1:

$last = end($this->uri->segments); 
//Where, segments is a class variable.

Alternative 2:

$last = end($this->uri->segment_array());

Alternative 3:

$total = $this->uri->total_segments();
$last = $this->uri->segment($total);