[BlackHorse]

INDRODUCTION
In this tutorial we will learn about how to make a AFK system
STEP 1
Include a_samp which is important for every FS

PHP Code:

#include a_samp 


STEP 2
Make a command for afk

PHP Code:

public OnPlayerCommandText(playerid,cmdtext[])
{
    if (strcmp("//The command you like in which player go AFK", cmdtext, true, 10) == 0)
    {
        new Float:health; //make a new variable which will use in health
        GetPlayerHealth(playerid,health);//health of player which is important or players cheat in health
        if( health > 100 )//player health is more than 100
        {
            TogglePlayerControllable(playerid, 0);//Setting player controllable to 0 to disable controlles of player
            SetPlayerHealth(playerid, 99999);//If you set players health less the player can die
            //There you can do anything like send message to all or him
            return 1;
        }
        if( health < 100 )//player health is less than 100
        {
            SendClientMessage(playerid, //The color you like comment end\\,"You haven't enough health");
            return 1;
        }
        return 1;
    }
    return 1; 


STEP 3
Make a command in which player back from AFK

PHP Code:

    if (strcmp("//The command you like", cmdtext, true, 10) == 0)
    {
        TogglePlayerControllable(playerid, 1);//1 means Player's controll enable
        //You can add anything like message to all or him
        return 1;
    }
    return 0;
}