Take the periods out of a string?

[Confusion09]

Can someone please tell me how to take periods out of a string? I've search 3 different forums and I'm still unable to find the answer 🙁. I know it should look something like this though 😉:

preg_replace("[/.]", "", $string)

Thank you.

[devinemke]

$string = 'this.string.has.periods.in.it';
echo str_replace('.', '', $string);