相对路径在cron PHP脚本中不工作 [英] Relative path not working in cron PHP script

问题描述

如果PHP脚本作为cron脚本运行，则如果使用相对路径，则include脚本通常会失败。例如，如果您有

If a PHP script is run as a cron script, the includes often fail if relative paths are used. For example, if you have

require_once('foo.php');

文件foo.php将在命令行运行时找到，而不是从cron脚本。

the file foo.php will be found when run on the command line, but not when run from a cron script.

一个典型的解决方法是先将chdir导入工作目录，或使用绝对路径。我想知道，但是，cron和shell之间是什么不同导致这种行为。为什么在cron脚本中使用相对路径时失败？

A typical workaround for this is to first chdir to the working directory, or use absolute paths. I would like to know, however, what is different between cron and shell that causes this behavior. Why does it fail when using relative paths in a cron script?

推荐答案

当运行时脚本的工作目录可能不同一个cron。另外，有一些关于PHP的require（）和include（）的混乱，这导致了工作目录的混乱是真正的问题：

The working directory of the script may be different when run from a cron. Additionaly, there was some confusion about PHPs require() and include(), which caused confusion about the working directory really being the problem:

include('foo.php') // searches for foo.php in the same directory as the current script
include('./foo.php') // searches for foo.php in the current working directory
include('foo/bar.php') // searches for foo/bar.php, relative to the directory of the current script
include('../bar.php') // searches for bar.php, in the parent directory of the current working directory

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