php removing excess whitespace

Question

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

hello        world

to

hello world

Anyone has any idea how to do that in PHP?

Answer 1

With a regexp :

preg_replace('/( )+/', ' ', $string);

If you also want to remove every multi-white characters, you can use s (s is white characters)

preg_replace('/(s)+/', ' ', $string);