PHP构造函数中的全局变量 [英] Global variable inside a constructor with PHP

问题描述

这应该很明显，但是我对PHP变量范围有些困惑.

This should be obvious, but I'm getting a bit confused about PHP variable scope.

我在构造函数中有一个变量，以后我想在同一类的函数中使用该变量.我当前的方法是这样:

I have a variable inside a Constructor, which I want to use later in a function in the same class. My current method is this:

<?php

class Log(){

   function Log(){
      $_ENV['access'] = true;
   }

   function test(){
      $access = $ENV['access'];
   }

}

?>

有没有比滥用环境变量更好的方法了?谢谢.

Is there a better way to do this than abusing environment variables? Thanks.

推荐答案

您可以使用类变量，该类变量具有... class的上下文:
(当然是PHP 5的示例；我已经重写了几件事，因此您的代码更加符合PHP5)

You could use a class variable, which has a context of... a class :
(Example for PHP 5, of course ; I've re-written a few things so your code is more PHP5-compliant)

class Log {
   // Declaration of the propery
   protected $_myVar;

   public function __construct() {
      // The property is accessed via $this->nameOfTheProperty :
      $this->_myVar = true;
   }

   public function test() {
      // Once the property has been set in the constructor, it keeps its value for the whole object :
      $access = $this->_myVar;
   }

}

您应该看一下:

• PHP手册的类和对象"部分
• 对于这个特定问题，请参见属性

• The "Classes and Objects" section of the PHP manual
• And, for this specific question, the sub-section Properties

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