PHP Unconference Europe 2015

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

DIRECTORY_SEPARATOR (string)
PATH_SEPARATOR (string)
Available since PHP 4.3.0. Semicolon on Windows, colon otherwise.
SCANDIR_SORT_ASCENDING (integer)
Available since PHP 5.4.0.
SCANDIR_SORT_DESCENDING (integer)
Available since PHP 5.4.0.
SCANDIR_SORT_NONE (integer)
Available since PHP 5.4.0.
add a note add a note

User Contributed Notes 3 notes

up
10
Anonymous
7 months ago
In PHP 5.6 you can make a variadic function.

<?php
/**
* Builds a file path with the appropriate directory separator.
* @param string $segments,... unlimited number of path segments
* @return string Path
*/
function file_build_path(...$segments) {
    return
join(DIRECTORY_SEPARATOR, $segments);
}

file_build_path("home", "alice", "Documents", "example.txt");
?>

In earlier PHP versions you can use func_get_args.

<?php
function file_build_path() {
    return
join(DIRECTORY_SEPARATOR, func_get_args($segments));
}

file_build_path("home", "alice", "Documents", "example.txt");
?>
up
13
Anonymous
1 year ago
For my part I'll continue to use this constant because it seems more future safe and flexible, even if Windows installations currently convert the paths magically. Not that syntax aesthetics matter but I think it can be made to look attractive:

<?php
$path
= join(DIRECTORY_SEPARATOR, array('root', 'lib', 'file.php');
?>
up
0
Paulo Marques
1 year ago
DIRECTORY_SEPARATOR is not necessarily needed, PHP always converts / to the appropriate character in its file functions.
It is good practice, though.
To Top