PHP 7.2.0 Release Candidate 2 Released

Predefined Constants

DIRECTORY_SEPARATOR (string)
PATH_SEPARATOR (string)
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.
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User Contributed Notes 5 notes

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21
Anonymous
3 years 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");
?>
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26
Anonymous
3 years 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');
?>
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-2
zhangyangcisco at qq dot com
3 months ago
"DIRECTORY_SEPARATOR is not necessarily needed, PHP always converts / to the appropriate character in its file functions.It is good practice, though.", but you may always use DIRECTORY_SEPARATOR if you only display it on the screen
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-36
Paulo Marques
4 years ago
DIRECTORY_SEPARATOR is not necessarily needed, PHP always converts / to the appropriate character in its file functions.
It is good practice, though.
up
-26
orlov0562 at gmail dot com
2 years ago
While debugging, this function return error number and it's difficult to remember all errors codes, so I think it's should be there.

<?php
print_r
([
   
'PREG_NO_ERROR' => PREG_NO_ERROR,
   
'PREG_INTERNAL_ERROR' => PREG_INTERNAL_ERROR,
   
'PREG_BACKTRACK_LIMIT_ERROR' => PREG_BACKTRACK_LIMIT_ERROR,
   
'PREG_RECURSION_LIMIT_ERROR' => PREG_RECURSION_LIMIT_ERROR,
   
'PREG_BAD_UTF8_ERROR' => PREG_BAD_UTF8_ERROR,
   
'PREG_BAD_UTF8_OFFSET_ERROR' => PREG_BAD_UTF8_OFFSET_ERROR,
]);
?>

Result:

Array
(
    [PREG_NO_ERROR] => 0
    [PREG_INTERNAL_ERROR] => 1
    [PREG_BACKTRACK_LIMIT_ERROR] => 2
    [PREG_RECURSION_LIMIT_ERROR] => 3
    [PREG_BAD_UTF8_ERROR] => 4
    [PREG_BAD_UTF8_OFFSET_ERROR] => 5
)
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