[Evocator]

You need to get the player's name, also returning in a loop is not so much recommended because itll stop it.

Код:

CMD:jail(playerid, params[]) 
{
	new 
		name[MAX_PLAYER_NAME], 
		string[45 + MAX_PLAYER_NAME]
	;

	GetPlayerName(playerid, name, MAX_PLAYER_NAME);

	SendClientMessage(playerid, -1, "You are jailed for 5 minutes. Reason: Unknown."); 

	format(string, sizeof (string), "%s is jailed for 5 minutes. Reason: Unknown.", name); 

	for(new i; i != MAX_PLAYERS; i++) 
	{ 
		if (!IsPlayerConnected(playerid))
			continue;

		if (i == playerid)
			continue;
			
		SendClientMessage(i, -1, string); 
	} 

	return 1;
}