[Calgon]

It doesn't exist; It's not a native SA-MP function for Players, but that doesn't mean you can't make it yourself. I've renamed it to avoid collisions with the NPC function.

pawn Код:

#define SendPlayerCommand OnPlayerCommandText

Place the code above at (or near) the top of your script, and you'll be able to use it like so:

pawn Код:

public OnPlayerSpawn(playerid)
{
   SetPlayerPos(playerid,x,y,z); // I hope you've defined x, y and z as floats somewhere
   SendPlayerCommand(playerid, "/join");
   return 1;
}