Php get extension from filepath

How to get the extension of a file using PHP.

In this guide, we are going to show you how to get the extension of a file using PHP.

In the examples below, we will use PHP’s pathinfo function instead of one of those nasty, error-prone “hacks” that you will see elsewhere on the Internet.

Getting the file extension using PHP.

The pathinfo function returns information about a given file path.

You can use it to get the directory name, the base name, the file name and the extension. In our case, we obviously want the extension.

Take a look at the following example:

//The file path. $filename = 'dir/test.txt'; //Get the extension using pathinfo $extension = pathinfo($filename, PATHINFO_EXTENSION); //var_dump the extension - the result will be "txt" var_dump($extension);

In the code above, we supplied the pathinfo function with the constant PATHINFO_EXTENSION.

As a result, it will return the string “txt”.

What if there is no extension?

If the file does not have an extension, then the pathinfo function will return an empty string.

//The file path. $filePath = 'path/to/file/empty'; //Attempt to get the extension. $extension = pathinfo($filePath, PATHINFO_EXTENSION); //var_dump var_dump($extension);

If you run the snippet above, it will print out the following:

What if there are multiple periods / dots?

This function will also work if the file in question has multiple periods or dots.

//A filename with two periods. $fileName = 'folder/example.file.jpg'; //Get the extension. $extension = pathinfo($filePath, PATHINFO_EXTENSION); //$extension will contain the string "jpg" var_dump($extension);

If you look at the PHP code above, you will see that our filename contains two periods.

However, the pathinfo function is still able to return the correct extension name.

Special characters.

If there is a chance that your filename might contain special multibyte characters, then you will need to set the matching locale information.

This is because the pathinfo function is “locale aware.”

You can do this by using PHP’s setlocale function like so:

setlocale(LC_ALL, "en_US.UTF-8");

An example of simplified Chinese:

setlocale(LC_ALL, 'zh_CN.UTF-8');

Or, if the file names contain Russian characters:

setlocale(LC_ALL, 'ru_RU.UTF-8');

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Php get extension from filepath

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How to retrieve the extension, filename from a filepath with javascript and php

Learn how to retrieve the filename or extensions from a filepath with javascript or php.

Retrieve the filename with extension

Javascript

To retrieve the filename, we will split by the slash caracter /. To achieve this in Javascript, we will use the following Regular Expression /^.*[\\\/]/ :

// Any filepath, even inverted slash // var filepath = "\\myfilepath\\extensions\\filename.png"; var filepath = "/myfilepath/extensions/filename.png"; // Use the regular expression to replace the non-matching content with a blank space var filenameWithExtension = filepath.replace(/^.*[\\\/]/, ''); // outputs filename.png console.log(filenameWithExtension);

The regular expression will return the remaining text from the last / (slash character). As not any file can contain / in his name but \ too, this function will work for all the cases.

In case that you don’t want to use a regular expression because you’re sure that the provided filepaths only use a defined type of slash (either / or \ ), you can split the string by the specified character and then obtain the last item:

var filepath = "/myfilepath/extensions/filename.png"; // With a normal slash var group = filepath.split("/"); // or a path with an inverted slash // var group = filepath.split("\\"); // Use the regular expression to replace the non-matching content with a blank space var filenameWithExtension = group.pop(); // Or if you can't use pop() // var filenameWithExtension = group[group.length - 1]; // outputs filename.png console.log(filenameWithExtension);

PHP

With PHP we will use the basename function which is available in all php versions :

$filepath = "/myfilepath/extensions/filename.jpg"; $filename = basename($filepath); // filename.jpg

Note: basename has a known bug when processing asian characters, to avoid this you can use a Regular Expression and preg_replace instead :

$filepath = "/myfilepath/extensions/filename.jpg"; $filename = preg_replace('/^.+[\\\\\\/]/', '', $filepath); // filename.jpg

Retrieve the file extension

Javascript

To retrieve the extension from a path (or filename, it doesn’t matter in this case) with Javascript we will split the string by . character and we will retrieve the last item of the obtained array.

var path = "path/a-long/path/to-my/file.jpg"; var path_splitted = path.split('.'); var extension = path_splitted.pop(); // Here the file will not have extension ! if(extension === path) < // The filepath doesn't have . characters, that means doesn't have extension. for example : // if you try with : path/to/my/file/thisisafile // extension == path/to/my/file/thisisafile >// show extension console.log(extension); 

PHP

To retrieve the extension from a path with php we will use pathinfo function.

$path = "this-is-my/long/filepath/to/file.txt"; $ext = pathinfo($path, PATHINFO_EXTENSION);// PATHINFO_EXTENSION is a constant echo $ext; // output txt

Note: if pathinfo function is not available in your environment, use end function instead.

$path = "this-is-another-long-path/to/my/file.txt"; $array_ofpath = explode('.', $path);//explode returns an array $extension = end($array);

Carlos Delgado

Senior Software Engineer at EPAM Anywhere. Interested in programming since he was 14 years old, Carlos is a self-taught programmer and founder and author of most of the articles at Our Code World.

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PHP get file extensions (with code example)

Posted on Aug 03, 2022

You need to call the pathinfo() function to get the file extension in PHP.

Explanation

The pathinfo() is a built-in PHP function used to get information from a file path.

The function returns either an array or a string depending on the parameter you passed into it.

1. The $file string that you want to parse
2. The $flags to specify what you want to get from the $file

• PATHINFO_DIRNAME
• PATHINFO_BASENAME
• PATHINFO_EXTENSION
• PATHINFO_FILENAME

If you don’t pass a $flags value, then PHP will get all four information as an array of strings.

This is why to get a file extension, you pass the string of the file path and the PATHINFO_EXTENSION to the function:

When you upload a file using an HTML tag, you need to get the file name parameter from the $_FILES array.

Here’s an example code to get the extension from an HTML form:

The file extension is     When you put a file into the type and hit submit, the file extension will be printed on the page.

Here’s an example of the PHP code in action:

And now you’ve learned how to get the file extension in PHP. Nice work! 👍

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