(PHP 4 >= 4.0.3, PHP 5, PHP 7)
pathinfo — Returns information about a file path
$path
[, int $options = PATHINFO_DIRNAME | PATHINFO_BASENAME | PATHINFO_EXTENSION | PATHINFO_FILENAME
] )
pathinfo() returns information about
path: either an associative array or a string,
depending on options.
pathThe path to be parsed.
options
If present, specifies a specific element to be returned; one of
PATHINFO_DIRNAME,
PATHINFO_BASENAME,
PATHINFO_EXTENSION or
PATHINFO_FILENAME.
If options is not specified, returns all
available elements.
If the options parameter is not passed, an
associative array containing the following elements is
returned:
dirname, basename,
extension (if any), and filename.
Note:
If the
pathhas more than one extension,PATHINFO_EXTENSIONreturns only the last one andPATHINFO_FILENAMEonly strips the last one. (see first example below).
Note:
If the
pathdoes not have an extension, no extension element will be returned (see second example below).
If options is present, returns a
string containing the requested element.
| Version | Description |
|---|---|
| 5.2.0 |
The PATHINFO_FILENAME constant was added.
|
Example #1 pathinfo() Example
<?php
$path_parts = pathinfo('/www/htdocs/inc/lib.inc.php');
echo $path_parts['dirname'], "\n";
echo $path_parts['basename'], "\n";
echo $path_parts['extension'], "\n";
echo $path_parts['filename'], "\n"; // since PHP 5.2.0
?>
The above example will output:
/www/htdocs/inc lib.inc.php php lib.inc
Example #2 pathinfo() example showing difference between null and no extension
<?php
$path_parts = pathinfo('/path/emptyextension.');
var_dump($path_parts['extension']);
$path_parts = pathinfo('/path/noextension');
var_dump($path_parts['extension']);
?>
The above example will output something similar to:
string(0) "" Notice: Undefined index: extension in test.php on line 6 NULL
Note:
For information on retrieving the current path info, read the section on predefined reserved variables.
Note:
pathinfo() is locale aware, so for it to parse a path containing multibyte characters correctly, the matching locale must be set using the setlocale() function.
You shouldn't assign values as it is described in previous post
// wrong:
list( $dirname, $basename, $extension, $filename ) = array_values( pathinfo($file) );
if $file has no extension, you get wrong variable values: $extension would be assigned with 'filename' array element of pathinfo() result, but $filename - would be empty.
If a file has more than one 'file extension' (seperated by periods), the last one will be returned.
For example:
<?php
$pathinfo = pathinfo('/dir/test.tar.gz');
echo 'Extension: '.$pathinfo['extension'];
?>
will produce:
Extension: gz
and not tar.gz
Checked with version 5.5.12:
It works fine with filenames with utf-8 characters, pathinfo will strip them away:
<?php
print_r(pathinfo("/mnt/files/飛兒樂團光茫.mp3"));
?>
.. will display:
Array
(
[dirname] => /mnt/files
[basename] => 飛兒樂團光茫.mp3
[extension] => mp3
[filename] => 飛兒樂團光茫
)
Use this function in place of pathinfo to make it work with UTF-8 encoded file names too
<?php
function mb_pathinfo($filepath) {
preg_match('%^(.*?)[\\\\/]*(([^/\\\\]*?)(\.([^\.\\\\/]+?)|))[\\\\/\.]*$%im',$filepath,$m);
if($m[1]) $ret['dirname']=$m[1];
if($m[2]) $ret['basename']=$m[2];
if($m[5]) $ret['extension']=$m[5];
if($m[3]) $ret['filename']=$m[3];
return $ret;
}
?>
If you want only the file extension, use this:
<?php
$extension = substr(strrchr($filename, "."), 1);
?>
This is many times faster than using pathinfo() and getting the value from array.
Here's a neat wee function to grab the relative path to root (especially useful if you're using mock-directories to pass variables into scripts with mod_rewrite). The function simply iterates through every occurence of "/" within the REQUEST_URI environment variable, appending "../" to the output for every instance:
<?php
function path_to_root($path) {
$pathinfo = pathinfo($path);
$deep = substr_count($pathinfo[dirname], "/");
$path_to_root = "./";
for($i = 1; $i <= $deep; $i++) {
$path_to_root .= "../";
}
return $path_to_root;
}
path_to_root($REQUEST_URI);
?>
Here is a simple function that gets the extension of a file. Simply using PATHINFO_EXTENSION will yield incorrect results if the path contains a query string with dots in the parameter names (for eg. &x.1=2&y.1=5), so this function eliminates the query string first and subsequently runs PATHINFO_EXTENSION on the clean path/url.
<?php
function extension($path) {
$qpos = strpos($path, "?");
if ($qpos!==false) $path = substr($path, 0, $qpos);
$extension = pathinfo($path, PATHINFO_EXTENSION);
return $extension;
}
?>
Note that in PHP 4 (if you're stuck using it), pathinfo only provides dirname, basename, and extension, but not filename. This function will not split a file's stem and extension for you.
Sometimes, it's interessant to get the basename without extension.
So, I appended a new entry 'basenameWE' (Basename Without Extension) to the returned array.
<?php
// pathinfo improved
function pathinfo_im($path) {
$tab = pathinfo($path);
$tab["basenameWE"] = substr($tab["basename"],0
,strlen($tab["basename"]) - (strlen($tab["extension"]) + 1) );
return $tab;
}
$my_path = "/var/www/html/example.html";
echo "<pre>\n";
print_r( pathinfo_im($my_path) );
echo "</pre>\n";
?>
Out :
Array
(
[dirname] => /var/www/html
[basename] => example.html
[extension] => html
[basenameWE] => example
)
//pathinfo function example
<?php
//passing single argument
echo "<pre>";
print_r(pathinfo("/home/ramki/ramki.pdf"));
echo "</pre>";
//passing two agruments
$path=array(PATHINFO_DIRNAME,PATHINFO_BASENAME,PATHINFO_EXTENSION,PATHINFO_FILENAME);
foreach ($path as $value)
echo "<pre>".pathinfo("/home/ramki/ramki.pdf",$value)."</pre>";
?>
//output
/*
Array
(
[dirname] => /home/ramki
[basename] => ramki.pdf
[extension] => pdf
[filename] => ramki
)
/home/ramki
ramki.pdf
pdf
ramki
*/
If you want to easily assign the values returned by pathinfo to separate variable names, list isn't enough. You can use array_values() first to convert the associative array into the indexed array that list() expects:
// throws notices, variables aren't set
list( $dirname, $basename, $extension, $filename ) = pathinfo($file);
// works
list( $dirname, $basename, $extension, $filename ) = array_values( pathinfo($file) );
If you have filename with utf-8 characters, pathinfo will strip them away:
print_r(pathinfo("/mnt/files/飛兒樂團光茫.mp3"));
.. will display:
Array
(
[dirname] => /mnt/files
[basename] => .mp3
[extension] => mp3
[filename] =>
)
Note that this function seems to just perform string operations, and will work even on a non-existent path, e.g.
<?php
print_r(pathinfo('/no/where/file.txt'));
?>
which will output:
Array
(
[dirname] => /no/where
[basename] => file.txt
[extension] => txt
[filename] => file
)
any type of url parse_url can handle this will get the extension of
pathinfo(parse_url('URL GOES HERE',PHP_URL_PATH),PATHINFO_EXTENSION)
PHP equivalent for custom implementations. Will be nearly as fast or faster (with long paths):
<?php
$trimPath = rtrim($path, '/');
$slashPos = strrpos($trimPath, '/');
if ($slashPos !== false) {
$dirName = substr($trimPath, 0, $slashPos) ?: '/';
$baseName = substr($trimPath, $slashPos + 1);
} else {
$dirName = '.';
$baseName = $trimPath;
}
$dotPos = strrpos($baseName, '.');
if ($dotPos !== false) {
$fileName = substr($baseName, 0, $dotPos);
$extension = substr($baseName, $dotPos + 1);
} else {
$extension = '';
$fileName = $baseName;
}
?>
<?php
// your code goes here
echo phpversion();
print_r(pathinfo("/resources/img/stock/wxb001/美景.png"));
输出：
5.6.4-2
Array
(
[dirname] => /resources/img/stock/wxb001
[basename] => 美景.png
[extension] => png
[filename] => 美景
)
但是在php5.3.3版本中
<?php
// your code goes here
echo phpversion();
print_r(pathinfo("/resources/img/stock/wxb001/美景.png"));
输出：
5.3.3
Array
(
[dirname] => /var/www/www.shima.jp.net/resources/img/stock/wxb001
[basename] => .png
[extension] => png
[filename] =>
)
A little compat for < 5.2
<?php
function pathinfo_filename($file) { //file.name.ext, returns file.name
if (defined('PATHINFO_FILENAME')) return pathinfo($file,PATHINFO_FILENAME);
if (strstr($file, '.')) return substr($file,0,strrpos($file,'.'));
}
?>
A warning: this function varies depending on the platform it is being run on. For example, pathinfo('C:\Program Files\Adobe\Reader 9.0\Reader\AcroRd32.exe') will return a different result when run through a winOS PHP platform (local development) vs. a server's UNIX-based OS. A bit like the Locale settings, but unexpected.
at example from "qutechie at gmail dot com" you can only replace function 'strpos' with 'strrpos'. (strrpos — Find position of last occurrence of a char in a string)
It's simple. For example:
<?php
function filePath($filePath)
{
$fileParts = pathinfo($filePath);
if(!isset($fileParts['filename']))
{$fileParts['filename'] = substr($fileParts['basename'], 0, strrpos($fileParts['basename'], '.'));}
return $fileParts;
}
$filePath = filePath('/www/htdocs/index.html');
print_r($filePath);
?>
Output will be:
Array
(
[dirname] => /www/htdocs
[basename] => index.html
[extension] => html
[filename] => index
)
qutechie at gmail dot com wrote a fix for support for filename in PHP 4; however it gets it wrong whenever you have a filename with a . in it (so foo.bar.jpg would return foo instead of foo.bar).
A fix would be:
<?php
if(!isset($path_parts['filename'])){
$reversed_filename = strrev( $path_parts['basename'] );
$path_parts['filename'] = strrev( substr( $reversed_filename, strpos( $reversed_filename, '.' ) + 1 ) );
}
?>
The idea is that you reverse the string and create a substring that starts after the first '.' and then reverse the result.
Quick fix for lack of support for 'filename' in php4
<?php
$path_parts = pathinfo('/www/htdocs/index.html');
echo $path_parts['dirname'], "\n";
echo $path_parts['basename'], "\n";
echo $path_parts['extension'], "\n";
echo $path_parts['filename'], "\n"; // since PHP 5.2.0
// if php4
if(!isset($path_parts['filename'])){
$path_parts['filename'] = substr($path_parts['basename'], 0,strpos($path_parts['basename'],'.'));
}
?>
if you call pathinfo with a filename in url-style (example.php?with=parameter), make sure you remove the given parameters before, otherwise they will be returned as part of the extension.
extension => php?with=parameter
Further to my previous post.
This affects servers that run PHP as a cgi module
If you have your own server:
You can use the AcceptPathInfo directive to force the core handler to accept requests with PATH_INFO and thereby restore the ability to use PATH_INFO in server-side includes.
Further information:
http://httpd.apache.org/docs-2.0/mod/core.html#acceptpathinfo
Note: dirname will be "." (meaning current directory) if the path is just a file name. (PHP 5.4.34)
<?php
var_dump( pathinfo('file.ext', PATHINFO_DIRNAME) ); // string(1) "."
?>
This code is to work in index.php/var/var
if(isset($PATH_INFO)) {
$viewcode = explode('/', $PATH_INFO);
$num = count($viewcode);
if($num % 2 == 0) {
$viewcode[] = '';
$num++;
}
for($i = 1; $i < $num; $i += 2) {
$$viewcode[$i] = $viewcode[$i+1];
}
}
This function is not perfect, but you can use it to convert a relative path to a URL.
Please email me if you can make any improvements.
<?php
function mapURL($relPath) {
$filePathName = realpath($relPath);
$filePath = realpath(dirname($relPath));
$basePath = realpath($_SERVER['DOCUMENT_ROOT']);
// can not create URL for directory lower than DOCUMENT_ROOT
if (strlen($basePath) > strlen($filePath)) {
return '';
}
return 'http://' . $_SERVER['HTTP_HOST'] . substr($filePathName, strlen($basePath));
}
?>
pathinfo() which can be used with UTF filenames.
<?php
function pathinfo_utf($path)
{
if (strpos($path, '/') !== false) $basename = end(explode('/', $path));
elseif (strpos($path, '\\') !== false) $basename = end(explode('\\', $path));
else return false;
if (empty($basename)) return false;
$dirname = substr($path, 0, strlen($path) - strlen($basename) - 1);
if (strpos($basename, '.') !== false)
{
$extension = end(explode('.', $path));
$filename = substr($basename, 0, strlen($basename) - strlen($extension) - 1);
}
else
{
$extension = '';
$filename = $basename;
}
return array
(
'dirname' => $dirname,
'basename' => $basename,
'extension' => $extension,
'filename' => $filename
);
}
?>
For a good example of how platform independent this function is have a look at the different return values that Lostindream and I experienced. Mine is above and Lostindream's is below:
Array
(
[dirname] => /www/psychicblast/images/1
[basename] => my three girlfriends.jpg
[extension] => jpg
)
Array
(
[dirname] => /www/htdocs
[basename] => index.html
[extension] => html
[filename] => index
)
z
pathinfo will return null if 0 or null is specified for the option argument.
So you'll need to define it's value manually if the option field is omitted, to provide the default functionality.
<?php
public function getFileInfo($source = null, $option = null){
if(!$option){
//1 + 2 + 4
$option = PATHINFO_DIRNAME + PATHINFO_BASENAME + PATHINFO_EXTENSION;
if(defined('PATHINFO_FILENAME'))
$option += PATHINFO_FILENAME; //8
}
return pathinfo($source, $option);
}
$obj->getFileInfo("/test/file/someFile.txt");
?>
It's worth nothing that pathinfo returns foo/index.php for the directory when dealing with URLs like foo/index.php/bar
