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+Returns the rank of `member` in the sorted set stored at `key`, with the scores
+ordered from low to high. The rank (or index) is 0-based, which means that the
+member with the lowest score has rank `0`.
+
+Use `ZREVRANK` to get the rank of an element with the scores ordered from high
+to low.
+
+@return
+
+- If `member` exists in the sorted set, @integer-reply: the rank of `member`.
+- If `member` does not exist in the sorted set or `key` does not exist,
+  @bulk-string-reply: `nil`.
+
+@examples
+
+```cli
+ZADD myzset 1 "one"
+ZADD myzset 2 "two"
+ZADD myzset 3 "three"
+ZRANK myzset "three"
+ZRANK myzset "four"
+```