simplest, shortest way to count capital letters in a string with php?

Question

I am looking for the shortest, simplest and most elegant way to count the number of capital letters in a given string.

Answer 1

function count_capitals($s) {   return mb_strlen(preg_replace('![^A-Z]+!', '', $s)); } 

Answer 2

$str = "AbCdE";

preg_match_all("/[A-Z]/", $str); // 3