Function SetPlayerFacingAngle set a player's facing angle (Z rotation).
Angles are reversed in GTA:SA; 90 degrees would be East in the real world, but in GTA:SA 90 degrees is in fact West. North and South are still 0/360 and 180. To convert this, simply do 360 - angle.

(playerid, Float:ang)
int playerid The ID of the player to set the facing angle of.
float ang The angle the player should face.

Return Values:
  • 1: The function was executed successfully.
  • 0: The function failed to execute. The player specified does not exist.

SetPlayerFacingAngle( playerid, 0 ); //Player faces north
        north (0)
(90) west-   -east (270)      (Good way to remember: Never Eat Shredded Wheat)
        south (180)

Related Functions
The following functions may be useful, as they are related to this function in one way or another.