B.10 strrpos( ) Uses the Entire Needle

In PHP 4, strpos( ) uses an entire string as a needle, whereas strrpos( ) limits the needle to a single character. If you pass strrpos( ) a string of more than one character, it silently uses only the first character.

In PHP 5, strrpos( ) and strripos( ) now behave identically to strpos( ), in that they find strings instead of just the first character.