在一個控制器（CI）上創建變量

Question

我想問些什么，所以我想做可變的ip，像這樣的代碼

if (!empty($_SERVER["HTTP_CLIENT_IP"]))
{
  //check for ip from share internet
  $ip = $_SERVER["HTTP_CLIENT_IP"];
}
elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
{
  // Check for the Proxy User
  $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
else
{
  $ip = $_SERVER["REMOTE_ADDR"];
}

但是我的問題是我想將該變量$ip用於控制器（一個文件控制器）上的所有公共函數，我該如何做？

注意：我使用類似CodeIgniter的框架。

Answer 1

嘗試這個：

<?php
class MyController extends CI_Controller
{

    protected $ip;

    public function __construct()
    {
        parent::__construct(); //just added this, sorry

        if (!empty($_SERVER["HTTP_CLIENT_IP"])){
            //check for ip from share internet
            $this->ip = $_SERVER["HTTP_CLIENT_IP"];
        } elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){
            // Check for the Proxy User
            $this->ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
        } else {
            $this->ip = $_SERVER["REMOTE_ADDR"];
        }
    }

    public function index()
    {
        echo 'Your IP is '.$this->ip;
    }

    public function myMethod()
    {
        //you can use $this->ip in here too
    }

}

訪問http://host/path/to/CI/mycontroller/index以查看輸出

如果需要，可以更改$ip的可見性

Answer 2

將其放在控制器的構造函數中。

https://www.codeigniter.com/userguide3/general/controllers.html#class-constructors

    <?php
    class Yourconstructor extends CI_Controller {

            public function __construct()
            {
                    parent::__construct();

            private $ip;

            if (!empty($_SERVER["HTTP_CLIENT_IP"]))
            {
                //check for ip from share internet
                $this->ip = $_SERVER["HTTP_CLIENT_IP"];
            }
            elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
            {
                // Check for the Proxy User
                $this->ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
            }
            else
            {
                $this->ip = $_SERVER["REMOTE_ADDR"];
            }

            }
    }

    public function index() {

      if ($this->ip == $some_var_posted_or_whatever) {
         // do something here...
      }
    }