[Logic_]

You have never made a new variable called 'giveplayerid' but you are using 'params[0]'.

From

PHP код:

if(giveplayerid == playerid) return SendClientMessage(playerid, COLOR_GREY, "You can not use this command on yourself!"); 


To

PHP код:

if(params[0] == playerid) return SendClientMessage(playerid, COLOR_GREY, "You can not use this command on yourself!");