[英]require_once path/to/file.php vs file.php
I'm having the following issue when including a file that includes another file: 包含包含另一个文件的文件时出现以下问题:
// path: /ajax/request.php
require_once("../classes/obj/Car.php");
// path: /classes/obj/Car.php;
require_once("Vehicle.php"); // superclass, this works
require_once("../exception/NoWheelException"); // this doesn't work when Car.php is require_once()'d from /ajax/request.php
the problem seems to be that if a file A
requires a file B
that requires files C
and D
, it only works if C
and D
are used without "../"
, or "./"
previous to the file name, when using require_once()
. 问题似乎是,如果文件A
需要文件B
,文件B
需要文件C
和D
,则在使用时,仅当C
和D
在文件名前使用"../"
或"./"
情况下才有效require_once()
。
Is there any workaround or any ideas to fix this? 有任何解决方法或任何想法可以解决此问题?
Use __FILE__
so you know where it's being included from: 使用__FILE__
以便从以下位置知道它的包含位置:
require_once(dirname(__FILE__) . '/../exception/NoWheelException');
Where: 哪里:
__FILE__ == "/classes/obj/Car.php";
dirname(__FILE__) == "/classes/obj";
Also, a note I didn't know - if your version of PHP is new enough, __DIR__
appears to be equivalent to dirname(__FILE__)
另外,我不知道一个注释-如果您的PHP版本足够新, __DIR__
似乎等效于dirname(__FILE__)
More info on __FILE__
and other magic constants here 有关__FILE__
和其他魔术常数的更多信息,请__FILE__
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