Role of DIRECTORY_SEPARATOR in PHP _ PHP Tutorial

Function of DIRECTORY_SEPARATOR in PHP. In PHP, the role of DIRECTORY_SEPARATOR is an internal constant of php. it is used to display system separator commands and can be directly used without any definition or inclusion. Function of DIRECTORY_SEPARATOR in PHP in windows

DIRECTORY_SEPARATOR is an internal constant of php. it is used to display system separator commands and can be directly used without any definition or inclusion.

In windows, the path separator is \ (of course/can also run normally on some systems). In linux, the path separator is/, which leads to a problem, for example, if the development machine is windows and there is an image upload program, the directory for storing the specified Upload files on the debugging machine is:

Define (ROOT, dirname (_ FILE _). "/upload ");

Local debugging is normal, but errors may occur when uploaded to the linux server. So php introduced the DIRECTORY_SEPARATOR variable, which can be rewritten:

Define (ROOT, dirname (_ FILE _). DIRECTORY_SEPARATOR. "upload ");

DIRECTORY_SEPARATOR is a php built-in command that returns path separators related to the operating system. it returns \ on windows, and returns/on linux or unix-like, it is usually used when defining the path containing files or uploading and storing directories.
For example:

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Const DIR_SEP = DIRECTORY_SEPARATOR; // path separation in Windows/
Private function _ construct ()
{
$ This-> _ options = array (
Template_dir => templates. self: DIR_SEP, // directory where the template file is located
Cache_dir => templates. self: DIR_SEP. cache. self: DIR_SEP, // cache file storage directory
Auto_update => false, // whether to regenerate the cache when the template file is changed
Cache_lifetime => 0, // cache lifecycle (minutes), 0 indicates permanent
Suffix =>. html // template file suffix
);
}

DIRECTORY_SEPARATOR is an internal constant of php. it is used to display system separator commands and can be directly used without any definition or inclusion. In windows...