PHP method return this, effect on performance? [closed]

Question

How does it affect performance by making sure that all my setters return $this? To allow for chain calls similar to jQuery coding standards.

E.g:

public function setEnabled(){
    $_enabled = true;
    return $this;
}

I found this other question with no reference to the performance side, surley there is a negative

Answer 1

No significant performance impact. Objects are not cloned.