在Windows和Linux上获取绝对URL路径

Question

I am including a file called includes/db.php which in turn requires connection_details.php

The issue I am having is I must read the content of db.php with this following line.

$dbSettingsFile = realpath( dirname( __FILE__ ) )."\connection-details.txt";
$lines = file($dbSettingsFile);//file in to an array

But if I am in turn already including the db.php file from a file that is something like. /subfolder/file.php

with the line

require('../includes/db.php');

But this will always work on windows but am I right in saying because of the backward slash in the $dbSettingsFile variable it will not work in linux? I have to be very specific like this because if you removed the realpath and ran file.php it would not pick up the correct path.

Answer 1

You should always use absolute filename, because you can't be sure about base directory where search for relative path will start.

Use

require( __DIR__ . '/../includes/db.php' );

to be sure.

Slash character '/' will work as directory separator in both Windows and Linux. Be careful - in Windows filenames 'db.php' and 'DB.php' are the same file but not in Linux.