php removing excess whitespace

Question

I\'m trying to remove excess whitespace from a string like this:

hello        world

to

Answer 1

Not a PHP expert, but his sounds like a job for REGEX....

Again, PHP is not my language, but the idea is to replace multiple whitespaces with single spaces. The \s stands for white space, and the + means one or more. The g on the end means to do it globally (i.e. more than once).