About the relative path of the parent directory to the upper parent directory

{% include ': /.. /partials/main_nav.php "%}

Always remember to find a file with a relative path first to find its parent node, the parent node found, in a slash is the specified subdirectory, then down the line, so the use of relative path to find the file is

The first step:.. /(one that represents the parent node of this directory, which is the ancestor directory), to find the minimum parent node to use

The second step:/Sub-folder down to find the required files

You can see first to find the top-level Father folder: app, which is passed. /.. /implemented, so now: app=. /.. /; now know the top father, the sub-file should be very easy to find,

Need to note here Template.volt this file and Train folder is a side-by-side relationship, train folder point open and sub-file, so do not see the mistake, do not think of Template.volt as a sub-file train

Add: If it is a Web site development: Generally write absolute path, because, different files into the template file, if you do a relative path, different files introduced, the relative path is not the same

/indicates that the root directory is the DocumentRoot directory, the current directory directly write file names such as: a.php is the current directory of a.php, and/a.php means documentroot under the a.php is also equivalent to the domain name/a.php such as:/a.php= www.sina.com/a.php

About the relative path of the parent directory to the upper parent directory