php7.2 redis->ping() return value

Question

Excuse me, what should be the return value of $redis->ping() in php7.2?

Before using php5.6, it always returned PONG, and the manual also said this

But after upgrading to 7.2, I suddenly found that a 1 was returned. I don’t know why

Answer 1

This "1" returns the true value true. It also means there is a reply and the connection is successful.