/pm

if(strcmp(cmd, "/pm", true) == 0)
	{

		// Here the player will choose to who he will send a private message.
        if(strlen(pID) == 0) return SendClientMessage(playerid, 0xD1D1D1FF, "USAGE: /pm [PlayerID] [Message]");

        // If the player chose a non-occupied ID he will receive the message below.
        if(!IsPlayerConnected(strval(pID))) return SendClientMessage(playerid, 0xD62424FF, "ERROR: Wrong player name or player ID. ");
	    GetPlayerName(playerid, name, sizeof(name));
	    kreplace(name, '_', ' ');
	    GetPlayerName(strval(pID), pname, sizeof(pname));
	    kreplace(pname, '_', ' ');

		// Here it will take the message the player sent and the players names. ( The one who sent and the one who received the message )
	    format(strin, sizeof(strin), "(( PM from %s(%i):%s ))", name, playerid, cmdtext[4+strlen(pID)]);
	    format(str, sizeof(str), "(( PM sent to %s(%i):%s ))", pname, strval(pID), cmdtext[4+strlen(pID)]);

		// Here it will send the formats above.
	    SendClientMessage(strval(pID), COLOR_BRIGHT_PURPLE, strin);
	    SendClientMessage(playerid, COLOR_BRIGHT_PURPLE, str);

	    // The end.
	    return 1;
	}