PHP - Count number of commas in string

Question

How can I count the number of times a comma appears in a string such as this?

A,B,C,D

It should return "3"

Answer 1

substr_count($my_string, ",")

If you wish to get all the elements between commas as an array, you can always

$splitted = explode(",", $my_string)

Answer 2

You could use e.g. substr_count(), or explode().