PHP define（）似乎没有使用include（） [英] PHP define() doesn't seem to be working with include()

问题描述

我一直在OO PHP尝试我的手，目前有三个文件。我有一个class_lib.php，目前，只有一个databaseServer类，一个index.php文件和definitions.php文件。我想把所有敏感的数据库信息放入定义文件。但是，当我这样做，我在尝试连接到数据库时出现错误：Unkown server DB_HOST。我的定义文件为：

 <？php 
 define（DB_HOST，localhost）; 
 define（DB_USER，root）; 
 define（DB_PASS，password）; 
 define（DB_NAME，database）; 
？> 
  

然后在索引文件中使用它们：

  include（'definitions.php'）; 
 include（'class_lib.php'）; 
 
 $ testing = new databaseServer（）; 
 
 $ testing-> connect（DB_HOST，DB_USER，DB_PASS，DB_NAME）; 
  

我在databaseServer类中使用的函数是：

  function connect（$ host，$ user，$ pw，$ db）{
 $ this-> con = mysql_connect $ pw）; 
 if（！$ this-> con）{
 die（'Could not connect：'。mysql_error（））; 
} 
 $ this-> selectDb（$ db）; 
} 
 
 function selectDb（$ database）{
 $ this-> db = mysql_select_db（$ database，$ this-> con）; 
 if（！$ this-> db）{
 echo无法选择数据库：。 mysql_error（）; 
} 
} 
  

任何想法为什么这不行？我也试过将定义文件放入class_lib文件中的include中，但仍然无效。

解决方案

这应该工作正常，我从来没有见过它不工作。

• 100％确保包含的顺序正确（定义需要先加载）

  / li>
  

• 在definitions.php文件和索引文件中测试输出常量值



• 100％确保您正在拨打正确的档案

I've been trying my hand at OO PHP, and currently have three files. I have a class_lib.php which, at the moment, just has a databaseServer class, an index.php file and a definitions.php file. I want to put all my sensitive database info into the definitions file. However, when I do, I get an error when trying to connect to the database: "Unkown server DB_HOST". My definitions file is:

<?php
define("DB_HOST","localhost");
define("DB_USER","root");
define("DB_PASS","password");
define("DB_NAME","database");
?>

Then I use them in the index file like so:

include('definitions.php');
include('class_lib.php');

$testing = new databaseServer();

$testing->connect(DB_HOST,DB_USER,DB_PASS,DB_NAME);

And the function I use in the databaseServer class is this:

    function connect($host,$user,$pw,$db) {
        $this->con = mysql_connect($host,$user,$pw);
        if (!$this->con) {
            die('Could not connect: ' . mysql_error());
            }
        $this->selectDb($db);
        }

    function selectDb($database) {
        $this->db = mysql_select_db($database,$this->con);
        if (!$this->db) {
            echo "Could not Select database: " . mysql_error();
            }
        }

Any ideas why this would not work? I've also tried putting the definitions file into an include in the class_lib file, but it still doesn't work.

解决方案

This should work fine, and I've never seen it not work.

• Make 100% sure the includes are in the correct order (the defines need to be loaded first)

• Make test outputs of the constant values in the "definitions.php" file and the index file

• Make 100% sure you are calling the right files

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