PHP function to get file extension

Question

Can anyone help me change this script to use preg_split (recommended substitute by php.net) instead of split which is not used anymore. This function gets the file extension of any uploaded file in the variable $filename.

function findExtension ($filename)
{
   $filename = strtolower($filename) ;
   $exts = split("[/\\.]", $filename) ;
$n = count($exts)-1;
$exts = $exts[$n];
return $exts;
}

score 16 · Answer 1 · answered May 17 '11 at 15:42

You should just use pathinfo instead:

$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

score 2 · Accepted Answer · answered May 17 '11 at 15:44

2

Why don't u use this function : http://www.php.net/manual/fr/function.finfo-file.php or this one : http://fr2.php.net/manual/fr/function.pathinfo.php

you can also use explode

function findExtension ($filename)
{
   $filename = strtolower($filename) ;
   $exts = explode(".", $filename) ;
   $n = count($exts)-1;
   $exts = $exts[$n];
   return $exts;
}

answered May 17 '11 at 15:44

Brice Favre

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1

This is an easier way to understand the 'explode' function. Thanks – imbayago May 18 '11 at 08:47

score 2 · Answer 3 · answered May 17 '11 at 15:45

2

Instead of split you can just use explode. As you just want the extension, there's no reason to split by /, just split by the dot and get the last element with array_pop.

answered May 17 '11 at 15:45

jeroen

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Seems 'explode' could be file extension finding standard. Thanks – imbayago May 18 '11 at 08:45

score 2 · Answer 4 · answered May 17 '11 at 15:46

2

I prefer a function David Walsh posted, that uses the "strrchr" function to get the last occurrence of "." in a string.


function get_file_extension($file_name)
{
  return substr(strrchr($file_name,'.'),1);
}

answered May 17 '11 at 15:46

Mark Fruhling

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score 1 · Answer 5 · answered May 17 '11 at 15:45

1

If the file extension is the only part you want:

function GetExt($filename) {
    return (($pos = strrpos($filename, '.')) !== false ? substr($filename, $pos+1) : '');
}

answered May 17 '11 at 15:45

steveo225

11,394
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score 0 · Answer 6 · answered Jun 04 '14 at 03:47

My code will give file extension, removing query strings. pathinfo also return extension with string. so use my code if you want to know the exact file name:

$filename = 'http://doamin/js.jquery.min.js?v1.1.11';    
preg_replace('/\?.*/', '', substr(strrchr($filename, '.'), 1));

// output: js

score 0 · Answer 7 · answered May 17 '11 at 15:47

0

Perhaps something along these lines?

$string = "some/path_to_a_file.txt";
$pattern = preg_split('/\./', $string, -1, PREG_SPLIT_OFFSET_CAPTURE);

answered May 17 '11 at 15:47

Swift

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PHP function to get file extension

7 Answers7