new Float:PlayerHP[MAX_PLAYERS];
new Float:PlayerAP[MAX_PLAYERS];

public OnPlayerTakeDamage(playerid, issuerid, Float:amount, weaponid) {
    new str[128];
    format(str, sizeof(str), "playerid: %d, issuerid: %d, amount: %0.2f, weaponid: %d", playerid, issuerid, amount, weaponid);

    SendClientMessage(playerid, -1, str);
    SendClientMessage(issuerid, -1, str);

    new Float:HP, Float:AR;
    GetPlayerHealth(playerid, HP);
    GetPlayerArmour(playerid, AR);

    format(str, sizeof(str), "Real HP Lost: %0.2f, HP minus amount: %0.2f", (HP+AR) - (PlayerHP[playerid]+PlayerAP[playerid]), (PlayerHP[playerid]+PlayerAP[playerid]) - amount);
    SendClientMessage(playerid, -1, str);
    SendClientMessage(issuerid, -1, str);

    PlayerHP[playerid] = HP;
    PlayerAP[playerid] = AR;
}