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.
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