realpath_cache_size
If using Windows junction.exe to create a symlink, it seems impossible to get the real path to the file. Even __FILE__ contains the symlinked path, not the actual path of the file.
realpath
(PHP 4, PHP 5)
realpath — Returns canonicalized absolute pathname
Description
string realpath
( string
$path
)
realpath() expands all symbolic links and
resolves references to '/./', '/../' and extra '/' characters in
the input path and returns the canonicalized
absolute pathname.
Parameters
-
path -
The path being checked.
Note:
Whilst a path must be supplied, the value can be blank or
NULLIn these cases, the value is interpreted as the current directory.
Return Values
Returns the canonicalized absolute pathname on success. The resulting path will have no symbolic link, '/./' or '/../' components.
realpath() returns FALSE on failure, e.g. if
the file does not exist.
Note:
The running script must have executable permissions on all directories in the hierarchy, otherwise realpath() will return
FALSE.
Note: Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB.
Changelog
| Version | Description |
|---|---|
| 5.3.0 |
Prior to this release, if only the last path
component did not exist, realpath() would not fail on
*BSD systems. realpath() now fails in this case.
|
| 5.0.0 |
Prior to this release, a blank or NULL path would
cause realpath() to return the directory name of the script.
|
Examples
Example #1 realpath() example
<?php
chdir('/var/www/');
echo realpath('./../../etc/passwd');
?>
The above example will output:
/etc/passwd
Example #2 realpath() on Windows
On windows realpath() will change unix style paths to windows style.
<?php
echo realpath('/windows/system32');
?>
The above example will output:
C:\WINDOWS\System32
See Also
- basename() - Returns trailing name component of path
- dirname() - Returns parent directory's path
- pathinfo() - Returns information about a file path
add a note
User Contributed Notes
realpath - [34 notes]
dbags ¶
1 year ago
runeimp at gmail dot com ¶
25 days ago
Needed a method to normalize a virtual path that could handle .. references that go beyond the initial folder reference. So I created the following.
<?php
function normalizePath($path)
{
$parts = array();// Array to build a new path from the good parts
$path = str_replace('\\', '/', $path);// Replace backslashes with forwardslashes
$path = preg_replace('/\/+/', '/', $path);// Combine multiple slashes into a single slash
$segments = explode('/', $path);// Collect path segments
$test = '';// Initialize testing variable
foreach($segments as $segment)
{
if($segment != '.')
{
$test = array_pop($parts);
if(is_null($test))
$parts[] = $segment;
else if($segment == '..')
{
if($test == '..')
$parts[] = $test;
if($test == '..' || $test == '')
$parts[] = $segment;
}
else
{
$parts[] = $test;
$parts[] = $segment;
}
}
}
return implode('/', $parts);
}
?>
Will convert /path/to/test/.././..//..///..///../one/two/../three/filename
to ../../one/three/filename
Anonymous ¶
1 year ago
Note: If you use this to check if a file exists, it's path will be cached, and returns true even if the file is removed (use file_exists instead).
richpageau at yahoo dot co dot uk ¶
6 years ago
This is my attempt at writing a realpath replacement. I needed to to run some Adobe code on a server with realpath disabled and this seemed to do the job. It is written for a unix server, I suppose it could be made cross platform using DIRECTORY_SEPARATOR. (With thanks to Marc Noirot for his code).
<?php
function myRealPath($path) {
// check if path begins with "/" ie. is absolute
// if it isnt concat with script path
if (strpos($path,"/") !== 0) {
$base=dirname($_SERVER['SCRIPT_FILENAME']);
$path=$base."/".$path;
}
// canonicalize
$path=explode('/', $path);
$newpath=array();
for ($i=0; $i<sizeof($path); $i++) {
if ($path[$i]==='' || $path[$i]==='.') continue;
if ($path[$i]==='..') {
array_pop($newpath);
continue;
}
array_push($newpath, $path[$i]);
}
$finalpath="/".implode('/', $newpath);
// check then return valid path or filename
if (file_exists($finalpath)) {
return ($finalpath);
}
else return FALSE;
}
?>
David Beck ¶
6 years ago
Here's a function to canonicalize a URL containing relative paths. Ran into the problem when pulling links from a remote page.
<?php
function canonicalize($address)
{
$address = explode('/', $address);
$keys = array_keys($address, '..');
foreach($keys AS $keypos => $key)
{
array_splice($address, $key - ($keypos * 2 + 1), 2);
}
$address = implode('/', $address);
$address = str_replace('./', '', $address);
}
$url = 'http://www.example.com/something/../else';
echo canonicalize($url); //http://www.example.com/else
?>
Lars Scheithauer <l dot scheithauer at gmx dot de> ¶
8 years ago
This function is also nice to test for security-breaches. You can forbid the script to access files below a certain directory to prevent "../../../etc/shadow" and similar attacks:
<?php
// declare the basic directory for security reasons
// Please do NOT attach a "/"-suffix !
$basedir = '/var/www/cgi-bin/scriptfolder';
// compare the entered path with the basedir
$path_parts = pathinfo($_REQUEST['file_to_get']);
if (realpath($path_parts['dirname']) != $basedir) {
/* appropriate action against crack-attempt*/
die ('coding good - h4x1ng bad!');
}
?>
The url "script.php?file_to_get=../../../etc/shadow" will now result in an error.
eric at themepark dot com ¶
10 years ago
note that realpath() will chop any trailing delimiter like \ or / ...don't forget to add it back on if you need it.
Eric Mueller - themepark.com
php at keith tyler dot com ¶
1 year ago
Note that under Windows, a slash-rooted path will resolve on the local drive, and *not* necessarily C:\.
For example:
M:\>php -r "print realpath('/AUTOEXEC.BAT');"
[prints nothing, because there is no M:\AUTOEXEC.BAT]
But:
M:\>C:
C:\>php -r "print realpath('/AUTOEXEC.BAT');"
C:\AUTOEXEC.BAT
Same script, different response depending on current drive.
I'm inclined to argue that this function *should* use the value of %SystemDrive% as the "slash root" base.
hrcerqueira at gmail dot com ¶
3 years ago
if you just need to resolve a path that is not on your system, or you don't want to chdir to it, a simple regular expression can do the trick:
<?php
$p = '/cool/yeah/../zzz';
$p = preg_replace('/\w+\/\.\.\//', '', $p);
echo $p; //outputs /cool/zzz
?>
Isaac Z. Schlueter i at foohack dot com ¶
4 years ago
If you need to resolve a url against a base url, as the browser does with anchor tags, then realpath won't help, because it's not on your file system.
This function does that:
<?php
function resolve_href ($base, $href) {
// href="" ==> current url.
if (!$href) {
return $base;
}
// href="http://..." ==> href isn't relative
$rel_parsed = parse_url($href);
if (array_key_exists('scheme', $rel_parsed)) {
return $href;
}
// add an extra character so that, if it ends in a /, we don't lose the last piece.
$base_parsed = parse_url("$base ");
// if it's just server.com and no path, then put a / there.
if (!array_key_exists('path', $base_parsed)) {
$base_parsed = parse_url("$base/ ");
}
// href="/ ==> throw away current path.
if ($href{0} === "/") {
$path = $href;
} else {
$path = dirname($base_parsed['path']) . "/$href";
}
// bla/./bloo ==> bla/bloo
$path = preg_replace('~/\./~', '/', $path);
// resolve /../
// loop through all the parts, popping whenever there's a .., pushing otherwise.
$parts = array();
foreach (
explode('/', preg_replace('~/+~', '/', $path)) as $part
) if ($part === "..") {
array_pop($parts);
} elseif ($part!="") {
$parts[] = $part;
}
return (
(array_key_exists('scheme', $base_parsed)) ?
$base_parsed['scheme'] . '://' . $base_parsed['host'] : ""
) . "/" . implode("/", $parts);
}
?>
[EDIT BY danbrown AT php DOT net: Code contains a bugfix supplied by (Zhenya DOT Morozov AT gmail DOT com) on 23-JAN-09, to address the following issue:
'If your path contains "0" (or any "false" string) directory name, the function removes that directory from the path.']
Sven Arduwie ¶
5 years ago
Because realpath() does not work on files that do not
exist, I wrote a function that does.
It replaces (consecutive) occurences of / and \\ with
whatever is in DIRECTORY_SEPARATOR, and processes /. and /.. fine.
Paths returned by get_absolute_path() contain no
(back)slash at position 0 (beginning of the string) or
position -1 (ending)
<?php
function get_absolute_path($path) {
$path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);
$parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
$absolutes = array();
foreach ($parts as $part) {
if ('.' == $part) continue;
if ('..' == $part) {
array_pop($absolutes);
} else {
$absolutes[] = $part;
}
}
return implode(DIRECTORY_SEPARATOR, $absolutes);
}
?>
A test:
<?php
var_dump(get_absolute_path('this/is/../a/./test/.///is'));
?>
Returns: string(14) "this/a/test/is"
As you can so, it also produces Yoda-speak. :)
alban dot lopez+php dot net at gmail dot com ¶
5 years ago
Here's a little function to return the shortest relative path between dest folder and current folder (you can be replace $_SERVER['PHP_SEFL'] by your variable folder) :
<?php
// if you run in /var/www/
echo UnRealPath ('./'); // return "./"
echo UnRealPath ('./ajax-browser/AJAX-B/scripts/'); // return "./ajax-browser/AJAX-B/scripts/"
echo UnRealPath ('/var/'); // return "./../"
echo UnRealPath ('/opt/picasa/wine/'); // return "./../../opt/picasa/wine/"
function UnRealPath ($dest)
{
$Ahere = explode ('/', realpath($_SERVER['PHP_SEFL']));
$Adest = explode ('/', realpath($dest));
$result = '.'; // le chemin retouné dois forcement commancé par ./ c'est le but
while (implode ('/', $Adest) != implode ('/', $Ahere))// && count ($Adest)>0 && count($Ahere)>0 )
{
if (count($Ahere)>count($Adest))
{
array_pop($Ahere);
$result .= '/..';
}
else
{
array_pop($Adest);
}
}
return str_replace('//', '/', $result.str_replace(implode ('/', $Adest), '', realpath($dest)).(@is_dir(realpath($dest))?'/':''));
}
?>
Santosh Patnaik ¶
5 years ago
Given real paths of two files, this function finds the relative path of one ($dest) with respect to the other ($root).
<?php
echo rel_path('a/b/c', 'd/e'); // './../../a/b/c'
echo rel_path('a/b/c', 'a/b/c/d/e'); // './../..'
echo rel_path('a/b/c/d/e', 'a/b/c'); // './d/e'
function rel_path($dest, $root = '', $dir_sep = '/')
{
$root = explode($dir_sep, $root);
$dest = explode($dir_sep, $dest);
$path = '.';
$fix = '';
$diff = 0;
for($i = -1; ++$i < max(($rC = count($root)), ($dC = count($dest)));)
{
if(isset($root[$i]) and isset($dest[$i]))
{
if($diff)
{
$path .= $dir_sep. '..';
$fix .= $dir_sep. $dest[$i];
continue;
}
if($root[$i] != $dest[$i])
{
$diff = 1;
$path .= $dir_sep. '..';
$fix .= $dir_sep. $dest[$i];
continue;
}
}
elseif(!isset($root[$i]) and isset($dest[$i]))
{
for($j = $i-1; ++$j < $dC;)
{
$fix .= $dir_sep. $dest[$j];
}
break;
}
elseif(isset($root[$i]) and !isset($dest[$i]))
{
for($j = $i-1; ++$j < $rC;)
{
$fix = $dir_sep. '..'. $fix;
}
break;
}
}
return $path. $fix;
}
?>
spam at klickagent dot ch ¶
1 year ago
realpath() function for relative paths:
$relativePath = '../gallery/index/../../advent11/app/';
$pattern = '/\w+\/\.\.\//';
while(preg_match($pattern,$relativePath)){
$relativePath = preg_replace($pattern, '', $relativePath);
}
output: '../advent11/app/'
imagiro ¶
1 year ago
Here is a small and handy method to calculate the relative path from $from to $to. Note: On Windows it does not work when $from and $to are on different drives.
<?php
function relativePath($from, $to, $ps = DIRECTORY_SEPARATOR)
{
$arFrom = explode($ps, rtrim($from, $ps));
$arTo = explode($ps, rtrim($to, $ps));
while(count($arFrom) && count($arTo) && ($arFrom[0] == $arTo[0]))
{
array_shift($arFrom);
array_shift($arTo);
}
return str_pad("", count($arFrom) * 3, '..'.$ps).implode($ps, $arTo);
}
?>
netmosfera at gmail dot com ¶
2 years ago
please note that realpath is a performance killer
on my sys listing 100 files with realpath takes 0.2 sec (core2quad 6600 x64 4gbddr2)
in most cases, its better to use getcwd() instead and work with dirname() to resolve ".."
Jrg Wagner ¶
3 years ago
Please be aware that this function does NOT always strip a trailing slash!:
LINUX (tested with PHP 5.2.11):
---
realpath('.')
: string = "/myhttpdfolder"
realpath('./')
: string = "/myhttpdfolder"
realpath('fileadmin')
: string = "/myhttpdfolder/fileadmin"
realpath('fileadmin/')
: string = "/myhttpdfolder/fileadmin"
WINDOWS (tested with PHP 5.2.5):
---
realpath('.')
: string = "C:\\myhttpdfolder"
realpath('./')
: string = "C:\\myhttpdfolder\\"
realpath('fileadmin')
: string = "C:\\myhttpdfolder\\fileadmin"
realpath('fileadmin/')
: string = "C:\\myhttpdfolder\\fileadmin\\"
jpic ¶
3 years ago
There is no native function that does the opposite.
Pure-php implementation:
<?php
function getRelativePath( $path, $compareTo ) {
// clean arguments by removing trailing and prefixing slashes
if ( substr( $path, -1 ) == '/' ) {
$path = substr( $path, 0, -1 );
}
if ( substr( $path, 0, 1 ) == '/' ) {
$path = substr( $path, 1 );
}
if ( substr( $compareTo, -1 ) == '/' ) {
$compareTo = substr( $compareTo, 0, -1 );
}
if ( substr( $compareTo, 0, 1 ) == '/' ) {
$compareTo = substr( $compareTo, 1 );
}
// simple case: $compareTo is in $path
if ( strpos( $path, $compareTo ) === 0 ) {
$offset = strlen( $compareTo ) + 1;
return substr( $path, $offset );
}
$relative = array( );
$pathParts = explode( '/', $path );
$compareToParts = explode( '/', $compareTo );
foreach( $compareToParts as $index => $part ) {
if ( isset( $pathParts[$index] ) && $pathParts[$index] == $part ) {
continue;
}
$relative[] = '..';
}
foreach( $pathParts as $index => $part ) {
if ( isset( $compareToParts[$index] ) && $compareToParts[$index] == $part ) {
continue;
}
$relative[] = $part;
}
return implode( '/', $relative );
}
?>
Some tests forr phpunit:
<?php
static public function getRelativePathProvider( ) {
return array(
array(
'/srv/foo/bar',
'/srv',
'foo/bar',
),
array(
'/srv/foo/bar',
'/srv/',
'foo/bar',
),
array(
'/srv/foo/bar/',
'/srv',
'foo/bar',
),
array(
'/srv/foo/bar/',
'/srv/',
'foo/bar',
),
array(
'/srv/foo/bar',
'/srv/test',
'../foo/bar',
),
array(
'/srv/foo/bar',
'/srv/test/fool',
'../../foo/bar',
),
array(
'/srv/mad/xp/mad/model/static/css/uni-form.css',
'/srv/mad/xp/liria/',
'../mad/model/static/css/uni-form.css',
),
);
}
/**
* @dataProvider getRelativePathProvider
*/
public function testGetRelativePath( $path, $compareTo, $expected ) {
$result = getRelativePath( $path, $compareTo );
$this->assertEquals( $expected, $result );
}
?>
orssey ¶
4 years ago
<?php
Class RealPath
{
private $ServerPath;
private $ScriptPath;
private $AddSlashEnd;
function __construct()
{
$this->AddSlashEnd = "";
$this->ServerPath = $_SERVER['DOCUMENT_ROOT'];
$this->ScriptPath = substr(dirname($_SERVER['SCRIPT_FILENAME']), strlen($this->ServerPath));
}
private function Server($adress)
{
$ThisPath = @realpath($adress);
$ThisPathLength = strlen($ThisPath);
return substr($ThisPath, strlen($this->ServerPath), $ThisPathLength);
}
public function Absolute($adress)
{
return $_SERVER['SERVER_NAME'] . $this->Server($adress) . $this->AddSlashEnd;
}
public function RelativeServer($adress)
{
return $this->Server($adress) . $this->AddSlashEnd;
}
public function RelativeScript($adress)
{
$ScriptExplode = explode("/", $this->ScriptPath);
$ServerExplode = explode("/", $this->Server($adress));
$TmpCount = $ScriptCount = count($ScriptExplode);
$ServerCount = count($ServerExplode);
$ReturnPath = "";
for($i = 1; $i < $TmpCount; $i++)
{
if($ScriptExplode[$i] == $ServerExplode[$i])
--$ScriptCount;
else
break;
}
for($i = 1; $i < $ScriptCount; $i++)
$ReturnPath .= "/..";
for($i = $TmpCount - $ScriptCount + 1; $i < $ServerCount; $i++)
$ReturnPath .= "/" . $ServerExplode[$i];
return $ReturnPath . $this->AddSlashEnd;
}
public function AddSlash($value)
{
if(is_bool($value))
{
$this->AddSlashEnd = ($value)? "/" : "";
return true;
}
else
return false;
}
}
example:
$ObjectPath = new RealPath;
$ObjectPath->RelativeScript("../a/b../c/d/f../g../h");
info[at]adico.co.il ¶
4 years ago
for those who want to start realpath on windows platform and looking for example.
OR
for those who want to run zend framework on windows platform using the quick start guide
<?php
define( "_CUR_OS", substr( php_uname( ), 0, 7 ) == "Windows" ? "Win" : "_Nix" );
function checkCurrentOS( $_OS )
{
if ( strcmp( $_OS, _CUR_OS ) == 0 ) {
return true;
}
return false;
}
// public/index.php
//
// Step 1: APPLICATION_PATH is a constant pointing to our
// application/subdirectory. We use this to add our "library" directory
// to the include_path, so that PHP can find our Zend Framework classes.
if ( checkCurrentOS( "Win" ) ) {
$mappath = '/' . str_replace( "\\", "/", str_replace( "C:\\","", dirname(__FILE__) ) );
}
else {
$mappath = dirname(__FILE__);
}
define('APPLICATION_PATH', realpath( $mappath . '/../_privateadico/application/') );
set_include_path(
APPLICATION_PATH . '/../library'
. PATH_SEPARATOR . get_include_path()
);
?>
I took the index.php for zend which is was written for unix and ported it to windows.
The porting problem was with realpath function not understanding dirname(__FILE__) syntex on windows
waldemar dot axdorph at gmail dot com ¶
5 years ago
I made this function so that I could see if a user was trying to go above the current directory.
My top dir:
/var/www/dir/
User wanted
/var/www/
This comes in handy when you're making a php explorer/filemanager and you want your files in the directory above to be private.
Here it is
<?php
//usage
//$dir is the dir you are in
//$dir_top is the highest dir allowed.
//example
/*
if(above_dir('../', '/var/www/filemgr'))
die('Not allowed. Please stick to your directories');
*/
function above_dir($dir, $dir_top){
if($dir == $dir_top)
return false;
$dir = realpath($dir);
$dir_top = realpath($dir_top);
$dir = count(explode('/', $dir));
$dir_top = count(explode('/', $dir_top));
if($dir <= $dir_top){
return true;
}else{
return false;
}
}
?>
131 dot php at cloudyks dot org ¶
5 years ago
<?php
//rp like, working with absolute/relative path & a little bit shorter :p
function rp($path) {
$out=array();
foreach(explode('/', $path) as $i=>$fold){
if ($fold=='' || $fold=='.') continue;
if ($fold=='..' && $i>0 && end($out)!='..') array_pop($out);
else $out[]= $fold;
} return ($path{0}=='/'?'/':'').join('/', $out);
}
?>
alex at bartl dot net ¶
5 years ago
Sometimes it is helpful to check for the existance of a file
which might be found by using the include_path like in
<?php
include("file_from_include_path.php");
?>
A simple function iterates the include_path and tries all
possibilites, returns translated_local_path on success or false
if not found.
<?php
function mappath($path_to_translate){
$IncludePath=explode(PATH_SEPARATOR,get_include_path());
foreach($IncludePath as $prefix){
if(substr($prefix,-1)==DIRECTORY_SEPARATOR)
$prefix=substr($prefix,0,-1);
$try_path=sprintf("%s%s%s"
,$prefix,DIRECTORY_SEPARATOR,$path_to_translate);
if(file_exists($try_path))return($try_path);
}
return false;
}
?>
berglov1 at hotmail dot com ¶
5 years ago
There might be other solutions like mine in here,
but here is one more.
This function converts Virtual Paths into Relative Paths.
I needed that at one time, and I did'nt have much luck finding a solution amongst the PHP Functions in the manual.
<?php
function GetPath($RedPath) {
if(substr($RedPath, 0, 1) == "/") {
$SysPath = dirname($_SERVER['PHP_SELF']);
if(substr($RedPath, -1) == "/") $RedPath = substr($RedPath, 0, -1);
if(strlen($SysPath) == 1)
return ".".$RedPath;
elseif(strcmp($SysPath,$RedPath) == 0)
return "./";
else {
$s_tmp = split("/", $SysPath);
$r_tmp = split("/", $RedPath);
while(($r_tmp[$i] == $s_tmp[$i]) && $i < 10)
$i++;
$t_RedPath = end(split("/", $RedPath, ($i+1)));
if($i == count($s_tmp))
return "./".$t_RedPath;
else
return str_repeat("../", count($s_tmp)-$i).$t_RedPath;
}
}
else
return $RedPath;
}
?>
julabz at laposte dot net ¶
5 years ago
Here's a little function to return the relative path between two urls:
<?php
function get_relative_path($start_dir, $final_dir){
//
$firstPathParts = explode(DIRECTORY_SEPARATOR, $start_dir);
$secondPathParts = explode(DIRECTORY_SEPARATOR, $final_dir);
//
$sameCounter = 0;
for($i = 0; $i < min( count($firstPathParts), count($secondPathParts) ); $i++) {
if( strtolower($firstPathParts[$i]) !== strtolower($secondPathParts[$i]) ) {
break;
}
$sameCounter++;
}
if( $sameCounter == 0 ) {
return $final_dir;
}
//
$newPath = '';
for($i = $sameCounter; $i < count($firstPathParts); $i++) {
if( $i > $sameCounter ) {
$newPath .= DIRECTORY_SEPARATOR;
}
$newPath .= "..";
}
if( count($newPath) == 0 ) {
$newPath = ".";
}
for($i = $sameCounter; $i < count($secondPathParts); $i++) {
$newPath .= DIRECTORY_SEPARATOR;
$newPath .= $secondPathParts[$i];
}
//
return $newPath;
}
?>
php.netatjulian-lemburg.de ¶
7 years ago
You have a realpath.
Now you want a htmlpath.
First Suggestion:
<?php
function htmlpath($relative_path) {
$realpath=realpath($relative_path);
$htmlpath=str_replace($_SERVER['DOCUMENT_ROOT'],'',$realpath);
return $htmlpath;
}
?>
But this does not work on some servers.
Second Suggestion:
<?php
function htmlpath($realpath) {
$i = substr_count($_ENV["SCRIPT_URL"],'/')."<br>";
$baserealpath=realpath(str_repeat('../',$i-1));
$htmlpath=str_replace($baserealpath,'',$realpath);
return $htmlpath;
}
?>
pulstar at ig dot com dot br ¶
8 years ago
Sometimes you may need to refer to the absolute path of a file in your website instead of a relative path, but the realpath() function returns the path relative to the server's filesystem, not a path relative to your website root directory.
For example, realpath() may return something like this:
/home/yoursite/public_html/dir1/file.ext
You can't use this in an HTML document, because the web server will not find the file. To do so, you can use:
<?php
function htmlpath($relative_path) {
$realpath=realpath($relative_path);
$htmlpath=str_replace($_SERVER['DOCUMENT_ROOT'],'',$realpath);
return $htmlpath;
}
echo '<img src="',htmlpath('../../relative/path/to/file.ext'),'" border=1>';
?>
It will return something like:
<img src="/dir1/relative/path/to/file.ext" border=1>
jemptyg at rwmc dot net ¶
11 years ago
realpath() seems to be equivalent to ASP's Server.MapPath. On my Win2k box I have successfully used realpath() to give me the full path for a file outside of the document_root. This will be very useful in conjunction with is_dir and/or is_file, which require a full path.
jerome at dot451 dot com ¶
12 years ago
mkdir (and realpath) did not work because i'd used virtual() function to replace server side include in my file.
And i've just seen that virtual() function changes the current directory ... that's why !
jerome ;)
cory dot mawhorter gmail.com ¶
3 years ago
<?php
// fixes windows paths...
// (windows accepts forward slashes and backwards slashes, so why does PHP use backwards?
function fix_path($path) {
return str_replace('\\','/',$path);
}
// takes two absolute paths and determines if one is a subdirectory of the other
// it doesn't care if it is an immediate child or 10 subdirectories deep...
// use absolute paths for both for best results
function is_child($parent, $child) {
if(false !== ($parent = realpath($parent))) {
$parent = fix_path($parent);
if(false !== ($child = realpath($child))) {
$child = fix_path($child);
if(substr($child, 0, strlen($parent)) == $parent)
return true;
}
}
return false;
}
?>
viaujoc at videotron dot ca ¶
5 years ago
Beware that the use of a NULL value for the $path argument will give different results depending on the platform:
On Windows, realpath(null) will return the current path (same as realpath(".")).
On Linux (tested on Kernel 2.6) it will return FALSE.
bart at mediawave dot nl ¶
7 years ago
Here's another function that resolves references to '/./', '/../' and extra '/' characters in the input path and returns the canonicalized pathname.
<?php
function cleanPath($path) {
$result = array();
// $pathA = preg_split('/[\/\\\]/', $path);
$pathA = explode('/', $path);
if (!$pathA[0])
$result[] = '';
foreach ($pathA AS $key => $dir) {
if ($dir == '..') {
if (end($result) == '..') {
$result[] = '..';
} elseif (!array_pop($result)) {
$result[] = '..';
}
} elseif ($dir && $dir != '.') {
$result[] = $dir;
}
}
if (!end($pathA))
$result[] = '';
return implode('/', $result);
}
echo 'input: ', $path = '..//./../dir4//./dir5/dir6/..//dir7/', '<br />';
echo 'output: ', cleanPath($path), '<br />';
?>
Will return:
input: ..//./../dir4//./dir5/dir6/..//dir7/
output: ../../dir4/dir5/dir7/
roman dot vasicek at email dot cz ¶
3 years ago
You may want to change script behavior depending on the way how its code is invoked (included by another script / called directly). Following code do the job
<?php
if (realpath(__FILE__) == realpath($_SERVER['SCRIPT_FILENAME'])) {
// called directly
...
} else {
// included
...
}
?>
rlee at excel dot com ¶
5 years ago
Some users will notice that PHP applications malfunction when they upgrade to PHP 5.2.4 (included in Ubuntu 8.04 LTS) because realpath returns true for files that don't exist.
This is due to the inclusion of the Hardened-PHP Project's Suhosin Patch in many distributions by default. This patch replaces PHPs realpath function with the BSD implementation, which ignores the last path component.
The workaround is to use the file_exists function to verify that the file exists before using realpath to get its real path string.
e.g: instead of:
<?php
if (realpath($path)) {
$path = realpath($path);
} else {
throw new Exception('Path not found!');
}
?>
Do this:
<?php
if (file_exists($path)) {
$path = realpath($path);
} else {
throw new Exception('Path not found!');
}
?>
See http://www.hardened-php.net/suhosin/a_feature_list:realpath.html