(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
mb_strrpos — Find position of last occurrence of a string in a string
$haystack,$needle,$offset = 0,$encoding = null
   Performs a multibyte safe
   strrpos() operation based on the 
   number of characters. needle position is
   counted from the beginning of
   haystack. First character's position is
   0. Second character position is 1. 
  
haystack
       The string being checked, for the last occurrence
       of needle
      
needle
       The string to find in haystack.
      
offsetencodingThe encoding
parameter is the character encoding. If it is omitted or null, the internal character
encoding value will be used.
   Returns the numeric position of
   the last occurrence of needle in the
   haystack string. If
   needle is not found, it returns false.
  
| Version | Description | 
|---|---|
| 8.0.0 | needlenow accepts an empty string. | 
| 8.0.0 | Passing the encodingas the third argument 
       instead of an offset has been removed. | 
| 8.0.0 | encodingis nullable now. |