[Impact123]

Because i've seen you are a coder yourself, i just post a snippet.
One of the stocks is from SMlib.

Spoiler

PHP Code:

#include <sourcemod>
#pragma semicolon 1



public OnPluginStart()
{
    RegConsoleCmd("sm_test", Command_Test);
}



public Action:Command_Test(client, args)
{
    if(IsClientValid(client))
    {
        new target = Client_GetObserverTarget(client);
        
        if(IsClientValid(target))
        {
            PrintToChat(client, "Your Target is: %N", target);
        }
        else
        {
            PrintToChat(client, "Your Target is not available");
        }
    }
    
    return Plugin_Handled;
}




stock Client_GetObserverTarget(client)
{
    return GetEntPropEnt(client, Prop_Send, "m_hObserverTarget");
}


stock bool:IsClientValid(id)
{
    if(id > 0 && id <= MAXPLAYERS && IsClientInGame(id))
    {
        return true;
    }
    
    return false;
} 


Yours sincerely
Impact