[Logic_]

Care to fix the indentation and re-writing it from scratch?

Use this: https://sampforum.blast.hk/showthread.php?tid=568668 (use any other function)
and look at my code as a example of a good code.

EXAMPLE

PHP код:

CMD:pm(playerid, params[])
{
    new targetid, msg[75]; // 75 is enough
    if(sscanf(params, "us[75]", targetid, msg)) return SendClientMessage(playerid, -1, "ERROR");
    if(targetid == INVALID_PLAYER_ID) return SendClientMessage(playerid, -1, "ERORR"); // faster than IsPlayerConnected
    if(targetid == /* Blocking PM */) return SendClientMessage(playerid, -1, "ERROR");
    if(IsAdv(msg)) return SendClientMessage(playerid, -1, "ERROR"); // use Anti Adv function here
    new string[75 + MAX_PLAYER_NAME + 1]; // 75 + 24 + 1 = 100 (75 for the msg, 24 for the name, 1 for the null)
    format(string, sizeof string, "%s", your function);
    SendClientMessage(playerid, -1, string);
    format(string, sizeof string, "%s", your function);
    SendClientMessage(targetid, -1, string);
    return 1;
}