PHP - Count number of commas in string

How can I count the number of times a comma appears in a string 开发者_开发知识库such as this?

A,B,C,D

It should return "3"

substr_count($my_string, ",")

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

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

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

$str = "A,B,C,";
echo (string)(count(explode(",",$str))-1);

count

array_explode