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Делов-то...

PHP код:

public Pulsator(playerid)
{
    new Float:hp;
    GetPlayerHealht(playerid, hp);
    if(GetPVarInt(playerid, "Increase") == 1)
    {
        if(hp > 99.1) SetPVarInt(playerid,"Increase", 0);
        else SetPlayerHealth(playerid, hp + 1.0);
    }
    else if(GetPVarInt(playerid, "Increase") == 0)
    {
        if(hp < 1.1) SetPVarInt(playerid,"Increase", 1);
        else SetPlayerHealth(playerid, hp - 1.0);
    }
    return 1;
}