[Aly]

You can create an array as you said

Код:

#define MAX_SKINS 312
new unlockedSkin[MAX_PLAYERS][MAX_SKINS]; //This is meant to be a string

And then set it to 1 if it's unlocked and to 0 if it's not

Код:

unlockedSkin[playerid][SkinID] = '1'; //unlocked keep in mind we're using a string
unlockedSkin[playerid][SkinID] = '0'; //locked keep in mind we're using a string

Then you can use either MySQL or INI, depends on what you're server is using.
For MySQL you have to create a Column, let's say

Код:

unlockedSkin |  VARCHAR(312)

Why 312?
Because that's the number of skin available.