[[NWA]Hannes]

This works:

if(strcmp(cmdtext, "/setgravity", true, 11)==0)
{
if(!cmdtext[11]) return SendClientMessage(playerid, 0xFF0000FF, "Usage: /setgravity [gravity]");
SetGravity(cmdtext[12]);
return 1;
}

although you should use a different command processor since strcmp is pretty slow