[Unknown123]

I think you have to use SetPVar

Example:

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
    new Float:XZ;
    new Float:YZ;
    new Float:ZZ;
    GetPlayerPos(playerid, XZ, YZ, ZZ);
    {
        DeathArea = GangZoneCreate(XZ-20, YZ-20, XZ+20, YZ+20);
        SetPVarFloat(playerid, "DeathAreaXZ_1", XZ-20);
        SetPVarFloat(playerid, "DeathAreaYZ_1", YZ-20);
        SetPVarFloat(playerid, "DeathAreaXZ_2", XZ+20);
        SetPVarFloat(playerid, "DeathAreaXZ_2", YZ+20);
    }
    GangZoneShowForAll(DeathArea, VIRUS_ZONE_COLOR);
    return 1;
}

pawn Код:

if(IsPlayerInArea(i, GetPVarFloat(playerid, "DeathAreaXZ_1"), GetPVarFloat(playerid, "DeathAreaYZ_1"), GetPVarFloat(playerid, "DeathAreaXZ_2"), GetPVarFloat(playerid, "DeathAreaYZ_2"))

It it worth a try =/