Strip whitespaces

I am saving a field in a form and just messing around by entering  A        B           C

After the save the data is displayed as A B C ...ok fine

 

Go back to edit what i entered and it shows up as A        B           C

 

 

in my controller:

$clean = new Sanitize();
       // Sanitize the data
       $this->data = $clean->clean($this->data);

 

How can i strip out all extra spaces only allowing 1 between words? Preferably before the save so it is cleaned up before the database.

 

Thanks,

 

Dave

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