Read String and convert it to array with ; as new item

Question

I have a some strings that looks like this:

$str = '192.168.10.1;192.168.10.30;10.215.30.30;'

i would to read this type of strings and take each string and create an array of it where the ';' sign signlas end of an item so i should have an array:

$arr[0] = 192.168.10.1 
$arr[1] = 192.168.10.30
.
.
.

can someone assist please?