Spawn a mob

How do you spawn a mob with code? I asked @BalAnce but I want more info.

I spawned a Zombie with code and it worked. But I tried a Creeper then it crashed. Why?

what was the code you used for zombie

And what was the crash message?

Crash was spawnToAll on null. When it was a zombie, everything was ok lol.

code?

Same as slapper:

PHP:

        $nbt =  new Compound("",[
            new Enum("Pos",[
                new Double("",$x),
                new Double("",$y),
                new Double("",$z),
                ]),
            new Enum("Motion", [
                new Double("",0),
                new Double("",0),
                new Double("",0),
                ]),
            new Enum("Rotation", [
                new Float("",$yaw),
                new Float("",$pitch),
                ])
            ]);
        $entity = Entity::createEntity($mobname, $level->getChunk($x>>4, $z>>4), $nbt);
        $entity->spawnToAll();

Every var is defined and no problems.

You might need to set fuse for creeper.. Not sure.