PHP：包含和要求文件时抛出错误 [英] PHP: Error thrown when including and requiring files

问题描述

我尝试创建一个引导程序文件，但每当我尝试在另一个文件中包含或要求它时，会出现这样的错误：

警告： require_once（../ folder / file.php）[function.require-once]：无法打开流：没有这样的文件或目录......

致命错误： require_once（）[function.require]：在...中打开所需的'../folder/file.php'（include_path ='：'）失败>

绘制整个场景：
我有一个bootstrap文件，load.php。在其中，我连接到../config/config.php的配置文件。在加载文件上方，我在classes / database.php中有一个数据库类文件。在数据库文件中，我写了这个if语句：

  if（file_exists（'../ load.php'））{ 
 echo'load.php：它存在'; 
 require_once（'../ load.php'）; 
} else {
 echo'load.php：它不存在'; 
} 
  

在加载文件中我写了一个类似的if语句，但检查是否配置文件存在。令人惊讶的是，当我加载database.php文件时，我得到：

  load.php：它存在
 config.php ：文件不存在
  

但是当我加载load.php文件时，我得到：

  config.php：存在
  

以下是我的文件所在位置：

根目录： / Library / WebServer / Documents / project

config.php文件 /Library/WebServer/Documents/project/config/config.php

load.php文件： /Library/WebServer/Documents/project/includes/load.php

database.php file： /Library/WebServer/Documents/project/includes/classes/database.php

我需要这个bug的帮助。
谢谢，

解决方案

使用 dirname（__ FILE__）。 ../相对/路径/从/文件/中/哪个/打开/到/ config.php中 。从PHP 5.3开始，还有 __ DIR __ 常量

I tried to create a bootstrap file, but whenever I try to include or require it in another file an error like this keeps showing up:

Warning: require_once(../folder/file.php) [function.require-once]: failed to open stream: No such file or directory in...

Fatal error: require_once() [function.require]: Failed opening required '../folder/file.php' (include_path='.:') in...

To paint the entire scenario: I have a bootstrap file, load.php. In it, I connect to the config file at ../config/config.php. Above the load file I have a database class file at classes/database.php. In the database file I wrote this if-statement:

           if ( file_exists('../load.php') ) {
               echo 'load.php: It exists';
               require_once('../load.php');
           } else {
                  echo 'load.php: It does not exist';
                  }

In the load file I wrote a similar if-statement, but checking if the config file exists. Surprisingly, when I load the database.php file I get:

load.php: It exists
config.php: file doesn't exist

But when I load the load.php file and I get:

config.php: It exists

Here is where my files are located:

Root Directory: /Library/WebServer/Documents/project

config.php file /Library/WebServer/Documents/project/config/config.php

load.php file: /Library/WebServer/Documents/project/includes/load.php

database.php file: /Library/WebServer/Documents/project/includes/classes/database.php

I need help with this bug. Thanks,

解决方案

use dirname(__FILE__) . '../relative/path/from/file/in/which/opened/to/config.php'. From PHP 5.3 there is also __DIR__ constant

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