dumb split code question

[viveleroi0]

Would there be a way that I would be able to easily seperate a code:

OTMICR

By every two characters? For example I want to split it into an array or respective variables like so:

var1="OT";
var2="MI";
var3="CR";

[ereptur]

$string = "OTMICR";
$string_array = str_split($string,"2");