To index an array for a player, you must use the [33], for every else you can use the number you want.
There you're trying to get the name/user id for a player, you must create an array in which you will keep the name, the number you put on that array is the length of the player name, in this case use 32 or less, because the engine has a limit of the name length. (It's not necessary to put a biggest number if you won't use all the array slots)
PHP Code:
new name[ 32 ]
get_user_name( id, name, 31 )
Whatever, i suggest to you to take a look to this post:
https://forums.alliedmods.net/showthread.php?t=172936 because my explanation it's a shit
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