[Jefff]

pawn Код:

if(Grass[i] != 0 && IsPlayerInRangeOfPoint(...))

or

pawn Код:

if(GetPlayerObjectPos(playerid, Grass[i], x, y, z) && IsPlayerInRangeOfPoint(...))

propably first code is better and if you want something for player it should be

Grass[playerid][i]

because if few players use /as there will be fun