How to find out the number of a certain character and a certain word and operate on these numbers?

Question

PHP

1) there is www.php.su/substr for the symbol, but how to get the number?
2) How to find out what sequence number the N word ends with?

Answer 1

www.php.su/strpos + www.php.su/strlen I
only recommend using mb_string: mb_substr, mb_strpos and mb_strlen respectively. Otherwise, on a multibyte encoding, it will not work as you expect.