strrpos() - string

Find the numeric position of the last occurrence of
   needle in the haystack string.

Parameters : 
 haystack - The string to search in. 
 needle - If needle is not a string, it is converted
       to an integer and applied as the ordinal value of a character. 
 offset - If specified, search will start this number of characters counted from the
       beginning of the string. If the value is negative, search will instead start
       from that many characters from the end of the string, searching backwards. 

Syntax

int strrpos
    ( string $haystack
   , string $needle
   [, int $offset = 0
  ] )

Example

It is easy to mistake the return values for "character found at
     position 0" and "character not found".  Here's how to detect
     the difference:

Output / Return Value

Limitations

Alternatives / See Also

Reference