[Threshold]

The easiest way would be to use PVars. You could also use a global variable if you really want to, but again, PVars are good for the lazy person who doesn't like making lots of variables

PHP код:

public OnPlayerClickPlayer(playerid, clickedplayerid, source) 
{
    if(pInfo[playerid][Adminlevel] || IsPlayerAdmin(playerid)) return 1;
    SetPVarInt(playerid, "ClickedPlayer", clickedplayerid); // Save the clicked player's ID into the PVar 'ClickedPlayer'.
    ShowPlayerDialog(playerid, 6 , DIALOG_STYLE_LIST, "Action", "Kick /n Ban", "Ok", "Close");
    // Shouldn't dialogid be 'Click', not '6'? Meh...
    return 1; 
}
public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if((dialogid == Click) //response for the showplayerdialog
    {
        if(response)
        {
            switch(listitem)
            {
                case 0://Kick
                {
                    new target = GetPVarInt(playerid, "ClickedPlayer"); // Get the ID stored in the PVar 'ClickedPlayer'.
                    if(!IsPlayerConnected(target)) // If the player that the admin clicked on is no longer connected...
                    {
                        SendClientMessage(playerid, -1, "That player is no longer connected.");
                        SetPVarInt(playerid, "ClickedPlayer", INVALID_PLAYER_ID); // Reset the ClickedPlayer to an invalid player ID.
                    }
                    else Kick(target);
                }
                case 1: //Ban
                {
                    new target = GetPVarInt(playerid, "ClickedPlayer"); // Get the ID stored in the PVar
                    if(!IsPlayerConnected(target)) // If the player that the admin clicked on is no longer connected...
                    {
                        SendClientMessage(playerid, -1, "That player is no longer connected.");
                        SetPVarInt(playerid, "ClickedPlayer", INVALID_PLAYER_ID); // Reset the ClickedPlayer to an invalid player ID.
                    }
                    else Ban(target);
                }
            }
        }
        return 1;
    }
    return 0;
} 


https://sampwiki.blast.hk/wiki/SetPVarInt
https://sampwiki.blast.hk/wiki/GetPVarInt