[xVIP3Rx]

Put it inside the loop

pawn Code:

YCMD:s(playerid, params[], help)
{
    new Float:x,Float:y,Float:z,Float:angle,string[145];
    
    if(IsPlayerInAnyVehicle(playerid))
    {
        GetVehiclePos(GetPlayerVehicleID(playerid),x,y,z);
        GetVehicleZAngle(GetPlayerVehicleID(playerid),angle);
    }
    else
    {
        GetPlayerPos(playerid,x,y,z);
        GetPlayerFacingAngle(playerid,angle);
    }
    
    for(new i;i<3;i++)
    {
        if(!PPosition[playerid][i][SavedPosition])continue;
        PPosition[playerid][i][XPos] = x;
        PPosition[playerid][i][YPos] = y;
        PPosition[playerid][i][ZPos] = z;
        PPosition[playerid][i][PAngle] = angle;
        PPosition[playerid][i][SavedPosition] = 1;
        break;
    }
    SendClientMessage(playerid,0x22B998AA,"Position saved! Type /l to load!");
    return 1;
}

EDITED few seconds after posting.