trim a string from every space

Is there a way to get rid of blank spaces in a variable?

e.g. $str = "foo f o o" should be "foofoo"

trim makes is good for the start and the end of the string, but what about the rest?

Thanks.

could you just do

$my_string = "foo f o o";
$str = str_replace(" ","",$my_string);

True!

So simple and great.

Thanks.