How do i change spaces to _?

[Sean]

I want to do this for some headline thingy. There is some simple way, but I don't know what to start looking for at php.net..

Any help here?

Thanks.

PS: This would happen to a variable.

[Mark Hensler]

$my_string = str_replace(" ", "_", $my_string);
PHP Docs: str_replace() (http://www.php.net/manual/en/function.str-replace.php)

[Sean]

Amazing..All you need to know is the tag, than it's simple! :)

Thanks.