Finding the type of variable

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Im trying to use this code to decide if params[1] is a number, string, or array. This is the only way I saw to do it. Its deciding if params[1] is an array or number. The params[1] is a this.variabe that could be either a string or array, and am trying to seperate the two in the actionserverside. help.

PHP Code:

  if (params[0] == "getReply")
  {
    temp.idtype = params[1];
    if (idtype.type() == 1)
      triggerClient("weapon", this.name, "getReply", this.db.(@params[2]).info, params[1]);
    if (idtype.type() == 3)
    {
      if (!(params[3]) && !(params[4]))
        triggerClient("weapon", this.name, "getReply2", this.db.(@params[2][0]).info, params[1]);
      if (!(params[3]) && params[4])
        triggerClient("weapon", this.name, "getReply3", this.db.(@params[2][1]).info, params[1]);
    }
  }