[BP13]

Code:

if (strcmp("/command", cmdtext, true)==0)
{
 	if(IsPlayerLAdmin(playerid))
	{
		//Thing you want to do here and no don't put a return after the command here.
	}
	else SendClientMessage(playerid, 0xFF0000AA, "You are not a admin");
	return 1;
}

I even tested this and it works.

Example:

Code:

public OnPlayerCommandText(playerid, cmdtext[])
{
	if (strcmp("/command", cmdtext, true)==0)
	{
 		if(IsPlayerLAdmin(playerid))
		{
			SendClientMessage(playerid, 0xFF0000AA, "You are a admin");
		}
		else SendClientMessage(playerid, 0xFF0000AA, "You are not a admin");
		return 1;
	}
	return 0;
}