PHP Function To Get A File Extension From A String

Comments

1. Phil Thompson

   This looks really useful, thanks.

2. ochronus

   Why reinvent the wheel? We have good ol’ pathinfo() :
   http://hu2.php.net/manual/en/function.pathinfo.php

   Array
   (
   [dirname] => .
   [basename] => some.file.extension
   [extension] => extension
   [filename] => some.file
   )

3. Isaac Van Name

   I came up with this snippet to get the file extension as well, using array functions:

4. Isaac Van Name

   … and it got cut out. Here’s the function, without tags:

   function get_file_extension($file_name) {
   return end(explode(‘.’,$file_name));
   }

5. Arup Malakar

   As mentioned by ochronus the following code does the exact same thing:

   $file = ‘/tmp/test.php’;
   echo pathinfo($file, PATHINFO_EXTENSION);

6. crivion

   or we can do it via end(explode(‘.’, “filename.ext)); easily

7. Rafieldex

   File extension from path:

   function f_extension($fn){
   $str=explode(‘/’,$fn);
   $len=count($str);
   $str2=explode(‘.’,$str[($len-1)]);
   $len2=count($str2);
   $ext=$str2[($len2-1)];
   return $ext;
   }

   $extesnion=f_extension(“files/file.jpg”); // returns jpg

   Try & enjoy!

8. Jorge

   What happens when you try to get the extension of “/etc/init.d/README” with the explode method?

   Just use the pathinfo().

• rafieldex

  Oh come on…i wrote this post quickly.

  function f_extension($fn){
  $str=explode(‘/’,$fn);
  $len=count($str);
  if (strpos($str[($len-1)],’.') === False) return False; // Has not .
  $str2=explode(‘.’,$str[($len-1)]);
  $len2=count($str2);
  $ext=$str2[($len2-1)];
  return $ext;
  }

9. Isaac Van Name

   @Jorge: Either way works, and it just ends up being a matter of preference. You have to consider how this function will usually be used on a web application; it will be grabbing the extension and making sure it’s an allowed extension for upload. Thus, the explode method would return something that doesn’t match a valid extension (like your README example), and the file upload would get declined.

   If you’re building a file explorer on the web, sure, use pathinfo(); that’s common sense. If you’re building a web app that takes uploads, then I can’t imagine the explode method would not be faster than pathinfo.

10. Gabriel

    Thanks for sharing !

11. sumit

    @crivion: please explain it with example

12. sumit

    end(explode(‘.’, “filename.ext));,
    explain how does it work

13. DaveDisaster

    I’ve run a bunch of microtime() tests, and almost every time pathinfo() is the fastest, by a healthy margin over end/explode. substr/strrchr seems to vary somewhere in the middle.

14. beauty

    There are many way to get file extension. For me, I use
    end(explode('.', $_FILES['fileupload']['name']));
    I think this is easy to understand code from it.

15. wael fareed

    // gif image uploaded
    if (isset($_FILES['file'])) {
    $file_extension =$_FILES['file']['extension'] ;
    $extension = substr(“$file_extension”, 6); // remove the image/ and the gif extension remains.
    echo $extension // return gif
    }

16. GotiBandhu

    Hello Everyone,
    In PHP, two function are available $_Get () and $_Post () for passing values from one page to another page, this functions are used to get the values which are passed from a user-filled form (User input value form), like user registration or login form etc…………………… for more details please check out the following link….
    http://www.mindstick.com/Articles/7591b2ed-8eb3-4382-8e72-cd58767a7f29/?PHP $_Get Function

    Thanks !!!!

17. sudhir

    Thanks , IT is really very user full.