[GrandParadise]

Use this one.

Code:

stock ProxDetector(Float:radi, playerid, string[],color)
{
new Float:x,Float:y,Float:z;
GetPlayerPos(playerid,x,y,z);
for(new player;player<MAX_PLAYERS;player++)
{
if(!IsPlayerConnected(playerid))continue;
if(IsPlayerInRangeOfPoint(playerid,radi,x,y,z))Sen dClientMessage(player,color,string);
}
}

Faster, smaller and better.