在PHP中使用未定义的常量erorr

问题描述

当我将代码切换到另一个系统时，我收到错误（以下代码所述）

配置：

php服务器：Xampp

请帮助我解决此问题。

代码：

 <？php 
课堂设置{
公共$主题； 
 public $ db_pf; 
 
函数__construct（）{
 $ this-> theme = default; 
 $ this-> db_pf = task_; 
 $ this-> paths（）; 
 $ this-> abbr（）; 
 $ this-> errors（）; 
 
 $ this-> enable_db_config（）; 
} 
函数path（）{
 define（ROOT，$ _ SERVER ['DOCUMENT_ROOT']）; 
 define（BP， / task /）; 
 define（ABSPATH， / task / ta-admin /）; 
 define（ADMPATH， / task / administrator /）; 
 define（INCLUDE_PATH，ABSPATH。 includes /）; 
 define（MODULE_PATH，ABSPATH。 modules /）; 
 define（CONTENT_PATH，ABSPATH。 contents /）; 
 define（THEME_PATH，ABSPATH。 templates /\".$ this-> theme。 /）; 
 define（STYLE_PATH，THEME_PATH。 styles /）; 
 define（IMAGE_PATH，THEME_PATH。 images /）; 
 define（JS_PATH，BP。 assets / js /）; 
 define（JQ_PATH，BP。 assets / jq /）; 
} 
函数enable_db_config（）{
 include（ROOT.BP。 ta-includes / class-db-config.php）; 
} 
函数abbr（）{
 define（task_title， Admin-Quit Tasker-）; 
 define（LOGIN_TITLE，管理员登录...）; 
 define（SLOGAN，为您的任务启用解决方案...）; 
} 
 function errors（）{
 define（NOTFOUND，找不到页面）; 
 define（GOBACK，，请按ok返回...）； 
} 
} 
 $ obj_settings = new settings（）; 
？> 
  

错误：

 注意：使用未定义的常量ROOT-在C：xampp\htdocs\task\ta-includes\class-settings.php中假定为'ROOT' 14 
 
注意：使用未定义的常数BP-在第15行$ b中的C：\xampp\htdocs\task\ta-includes\class-settings.php中假定为'BP' 
 $ b注意：使用未定义的常量ABSPATH-在第16行的C：\xampp\htdocs\task\ta-includes\class-settings.php中假定为'ABSPATH'
 
注意：使用未定义的常量INCLUDE_PATH-在C：linexampp\htdocs\task\ta-includes\class-settings.php中假定'INCLUDE_PATH'在第17行
 
注意：使用未定义的常量CONTENT_PATH-在第18行的C：bxampp\htdocs Ctask\ta-includes\class-settings.php中假定为'CONTENT_PATH'
 
注意：使用未定义常量THEME_PATH的定义-在第19行的C：$ xampp\htdocs $ task\ta-includes\class-settings.php中假定为'THEME_PATH'
 
注意：使用未定义常量风格_ PATH-在第20行上的C：xampp\htdocs\task\ta-includes\class-settings.php中假设'STYLE_PATH'
 
注意：使用未定义的常量JS_PATH-假定第21行的C：xampp\htdocs\task\ta-includes\class-settings.php中的'JS_PATH'
 
注意：使用未定义的常量JQ_PATH-假定为'JQ_PATH'在22行的C：xampp\htdocs\task\ta-includes\class-settings.php中
  

解决方案

您的常量必须为字符串。因此，您必须将它们用引号括起来：

  define（'ROOT'，$ _ SERVER ['DOCUMENT_ROOT'] ）; 
 ^ ^ 
  

如有疑问，请始终检查，在这种情况下

添加：

我发现在功能上有点 狡猾。如果您坚持不将它们移动到另一个文件（例如 config ），该文件在开始时就已加载，则至少将它们从类构造中删除。

I receive errors(mentioned below code) when I switched my code to another system,

Configurations:

OS : Windows 7php server : Xampp

Please help me to resolve this problem. thanks in advance.

CODE:

<?php
class settings{
    public $theme;
    public $db_pf;

    function __construct(){
        $this->theme="default";
        $this->db_pf="task_";
        $this->paths();
        $this->abbr();
        $this->errors();

        $this->enable_db_config();
    }
    function paths(){
        define(ROOT,$_SERVER['DOCUMENT_ROOT']);
        define(BP,"/task/");
        define(ABSPATH,"/task/ta-admin/");
        define(ADMPATH,"/task/administrator/");
        define(INCLUDE_PATH,ABSPATH."includes/");
        define(MODULE_PATH,ABSPATH."modules/");
        define(CONTENT_PATH,ABSPATH."contents/");
        define(THEME_PATH,ABSPATH."templates/".$this->theme."/");
        define(STYLE_PATH,THEME_PATH."styles/");
        define(IMAGE_PATH,THEME_PATH."images/");
        define(JS_PATH,BP."assets/js/");
        define(JQ_PATH,BP."assets/jq/");
    }
    function enable_db_config(){
        include(ROOT.BP."ta-includes/class-db-config.php");
    }
    function abbr(){
        define(task_title,"Admin-Quit Tasker-");
        define(LOGIN_TITLE," Administrator Login...");
        define(SLOGAN,"Enabling Solutions to your Tasks...");
    }
    function errors(){
        define(NOTFOUND,"Page not found");
        define(GOBACK," please press ok to go back...");
    }
}
$obj_settings=new settings();
?>

ERRORS:

Notice: Use of undefined constant ROOT - assumed 'ROOT' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 14

Notice: Use of undefined constant BP - assumed 'BP' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 15

Notice: Use of undefined constant ABSPATH - assumed 'ABSPATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 16

Notice: Use of undefined constant INCLUDE_PATH - assumed 'INCLUDE_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 17

Notice: Use of undefined constant CONTENT_PATH - assumed 'CONTENT_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 18

Notice: Use of undefined constant THEME_PATH - assumed 'THEME_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 19

Notice: Use of undefined constant STYLE_PATH - assumed 'STYLE_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 20

Notice: Use of undefined constant JS_PATH - assumed 'JS_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 21

Notice: Use of undefined constant JQ_PATH - assumed 'JQ_PATH' in C:\xampp\htdocs\task\ta-includes\class-settings.php on line 22

解决方案

Your constants need to be strings. So you have to "wrap" them in quotes like this:

define('ROOT',$_SERVER['DOCUMENT_ROOT']);
       ^    ^

When in doubt, always check the Manual, in that case define()

Add:
Also defining constants in a function is, what I find, a bit "dodgy". If you insist on not moving them to another (e.g. config) file which is loaded in the very beginning then at least take them out of the class construct.

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