[Tee]

Either you're on crack or something else.
1. The "changed" variable is not a float because playerid is NOT a float (0.0, 0.00152), it's an integer (1, 25, 30)
2. You don't need 9000 cells just for, what 500 players you have?

Anyway, here's your script:

pawn Код:

SetTimer("Highlight", 2000, true);

new changed[MAX_PLAYERS] = 0;
forward Highlight(playerid);
public Highlight(playerid)
{
    if(changed[playerid] == 0)
    {
        SetPlayerColor(playerid, 0xFF0000FF);
        changed[playerid] = 1;
    }
    else
    {
        SetPlayerColor(playerid, 0xFF9900FF);
        changed[playerid] = 0;
    }
}