访问另一个PHP文件中的类变量

问题描述：

I want to use variables in another php file as the class. But I get always the error: Notice: Undefined variable:...

First: I create a user object: File: index.php

<?php

// include the configs / constants for the db connection
require_once("config/config.php");

// load the user class
require_once("classes/User.php");

$user = new User();

include("views/order.php");

File: User.php

class User
{
   public $color = "green";
}

File livesearch.php

require_once("../classes/User.php");

echo $User->color;

I create an object from the class user in a index.php file, I use there also a require once to the User.php file and it works. Why I cant access the variable of the class?

我想在另一个php文件中使用变量作为类。但我总是得到错误：注意：未定义的变量：... p>

首先：我创建一个用户对象： File：index.php p>

 ＆lt;？php 
 
 //包括db connection 
require_once（“config / config.php”）的配置/常量; 
 
 //加载用户类
require_once（“classes  /User.php");
nnuseruser = new User（）; 
 
include（“views / order.php”）; 
  code>  pre> 
 
  文件：User.php  p> 
 
 
  class User 
 {
 public $ color =“green”; 
} 
  code>  pre> 
 \  n 文件livesearch.php  p> 
 
 
  require_once（“../ classes / User.php”）; 
 
echo $ User-＆gt; color; 
   pre> 
 
 我在index.php文件中从类用户创建一个对象，我在User.php文件中也使用了一次，并且它可以工作。 为什么我无法访问类的变量？ p> 
  div>

答

Variable names in PHP are case sensitive:

echo $User->color;

should be

echo $user->color;

Also the livesearch.php doesn't have access to the variables in index.php unless:

It is includes in index.php. In which case it has access to all the variables assigned in index.php before it was included.
livesearch.php includes index.php. In which case it has access to all the variables assigned in index.php after the point where index.php was included.

eg. Your files, but slightly modified:

File: index.php

// load the user class
require_once("User.php");

$user = new User();

include("livesearch.php");

File: User.php

class User
{
   public $color = "green";
}

File: livesearch.php

echo $User->color;

Is the same as writing:

// From User.php
class User
{
   public $color = "green";
}

// From index.php
$user = new User();

// From livesearch.php
echo $User->color;

答

PHP for File livesearch.php :

 require_once("../classes/User.php");

 $user = new User;
 echo $user->color;

答

you should to use singleton of design patterns for speed. I do not recommend such a usage in this case. ( this->color instead user::color ).

research design pattern, polymorphism.

answer

userclass.php class User { public $color = "green"; }

$User = new User;

livesearch.php require_once("../classes/User.php");

echo $User->color;

访问另一个PHP文件中的类变量

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