I was on a creative single player world on which I had customized the terrain. I wanted to test if doMobSpawn prevented passive mobs from spawning because I couldn't get a clear answer on the internet. After creating the world for the first time I let it load in and then set doMobSpawn to false. I flew quite a while in one direction and saw cows, sheep, pigs, horses, rabbits, donkeys, and squids. I then set the time to night, to make sure it was working, and immediately hostile mobs started spawning. I double checked that doMobSpawn was false and it was. To make sure I was using it correctly I set the game difficulty to peaceful so the hostile mobs would despawn, set doMobSpawn to true, and then set the game difficulty to hard. Hostile mobs started spawning again immediately. I'm going to attach a screenshot to show you what I mean.
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@ Zi-Wen Lin: Yeah, I read that on the internet, and then I read the opposite somewhere else on the internet. Anyway, that's not the problem, the problem is that MONSTERS still spawn. I was having some problems with fighting monsters because of my crappy laptop so I was hoping I could turn them off and still have hunger.
Animals aren't mobs. They can still spawn.
If you change doMobSpawn to true, the mobs will spawn again.
If you change it to false, the Mobs won't spawn