[SOLVED] How can I take a string and replace the space with a dash?

[pneudralics]

$string = "Hi this is my string";

//Want it to look like
$string = "Hi-this-is-my-string";

[mikesta707]

$string = str_replace(" ", "-" $string);

[pneudralics]

Thanks. Just forgot the ,

 

$string = str_replace(" ", "-", $string);