(PHP 4 >= 4.0.6, PHP 5)
mb_strpos — Find position of first occurrence of string in a string
$haystack
   , string $needle
   [, int $offset = 0
   [, string $encoding = mb_internal_encoding()
  ]] )Finds position of the first occurrence of a string in a string.
Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on.
haystackThe string being checked.
needle
       The string to find in haystack. In contrast
       with strpos(), numeric values are not applied
       as the ordinal value of a character.
      
offsetThe search offset. If it is not specified, 0 is used.
encodingThe encoding
parameter is the character encoding. If it is omitted, the internal character
encoding value will be used.
   Returns the numeric position of
   the first occurrence of needle in the
   haystack string. If
   needle is not found, it returns FALSE.