php - 在 yii 中声明全局变量并在 Controller 中使用它们

Question

我一直在尝试在 yii 中声明一个全局变量，它是一个 boolean 值，并在 Controller 的不同 Action 函数中改变它的值。下面是我正在努力实现的一个例子。

在 .../config/main.php 中我添加了以下数组: 'params'=>array('login' => 'true',),

在 .../protected/controller/testController.php 我添加了以下代码:

<?php
    class ApiController extends Controller{
public $x = '';

public function actionDisplay(){
$x=Yii::app()->params['login']; //so x now has the value "true"
echo $x; //this display "true" when i run this controller on this function
}

public function actionDisplay2(){
global $x;
    echo $x; //this for some reason does not contain the value true even if x is global
}

我怎样才能做到这一点而不必在每个函数中为全局变量分配一个值？如果我调用第二个函数，它会抛出 x 未定义的错误。我的计划是像在 Java 中那样使用全局变量，例如

public class Display{

public String x = " ";

public static void Display(){
x = "True"; //global variable x is assigned the String value "True"
}

public static void DisplayTwo(){
System.out.print("Value of x is: " + x); //this will print "Value of x is: True"
}

....

}
So basically, this is how i want to use the global variable in Yii framework. Any suggestions how to achieve this please?

Answer 1

您可以使用类变量来实现，这是一个示例:

<?php

class ApiController extends Controller
{
    public $lang = 'en';

    public function beforeAction($action)
    {
        if(Yii::app()->session->contains('lang'))
            $this->lang = Yii::app()->session['lang'];
        return parent::beforeAction($action);
    }

    public function afterAction($action,$params)
    {
        Yii::app()->session['lang'] = $this->lang;
        return parent::afterAction($action,$params);
    }

    public function actionDisplay(){
        echo 'In Display action';
        $this->lang = 'test'
        echo $this->lang;
    }

    public function actionDisplay2(){
        echo 'In Display2 action';
        echo $this->lang;
    }
}