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Like `TTL` this command returns the remaining time to live of a key that has an
expire set, with the sole difference that `TTL` returns the amount of remaining
time in seconds while `PTTL` returns it in milliseconds.
In Redis 2.6 or older the command returns `-1` if the key does not exist or if the key exist but has no associated expire.
Starting with Redis 2.8 the return value in case of error changed:
* The command returns `-2` if the key does not exist.
* The command returns `-1` if the key exists but has no associated expire.
@return
@integer-reply: TTL in milliseconds, or a negative value in order to signal an error (see the description above).
@examples
```cli
SET mykey "Hello"
EXPIRE mykey 1
PTTL mykey
```
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