Comments on: PHP Function To Get A File Extension From A String

By: sudhir

sudhir — Thu, 05 Jan 2012 06:06:24 +0000

Thanks , IT is really very user full.

By: GotiBandhu

GotiBandhu — Fri, 30 Sep 2011 12:56:48 +0000

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 !!!!

By: wael fareed

wael fareed — Thu, 30 Jun 2011 15:48:46 +0000

// 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
}

By: beauty

beauty — Mon, 30 May 2011 17:00:17 +0000

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.

By: DaveDisaster

DaveDisaster — Fri, 13 May 2011 17:11:40 +0000

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.

By: rafieldex

rafieldex — Tue, 21 Dec 2010 21:15:02 +0000

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;
}

By: sumit

sumit — Tue, 27 Apr 2010 13:19:13 +0000

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

By: sumit

sumit — Tue, 27 Apr 2010 13:17:30 +0000

@crivion: please explain it with example

By: Gabriel

Gabriel — Tue, 02 Mar 2010 19:23:19 +0000

Thanks for sharing !

By: Isaac Van Name

Isaac Van Name — Thu, 07 Jan 2010 14:51:42 +0000

@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.