PHP check file extension

Question

I have an upload script that I need to check the file extension, then run separate functions based on that file extension. Does anybody know what code I should use?

if (FILE EXTENSION == ???)
{
FUNCTION1
}
else if
{
FUNCTION2
}

Brombomb · Accepted Answer · 2013-02-19T20:50:15.237

127

pathinfo is what you're looking for

PHP.net

$file_parts = pathinfo($filename);

switch($file_parts['extension'])
{
    case "jpg":
    break;

    case "exe":
    break;

    case "": // Handle file extension for files ending in '.'
    case NULL: // Handle no file extension
    break;
}

edited Feb 19 '13 at 20:50

answered Sep 27 '11 at 02:48

Brombomb

6,988
4
38
57

1

What's the case for no extension? case NULL? case ""? – swl1020 Feb 19 '13 at 16:40
2

Updated. empty string `""` is for files then end with `.`. `NULL` is for no file extension. You could break out the case statement, but for the example I just group them together. – Brombomb Feb 19 '13 at 20:51
`pathinfo($pathtofile, PATHINFO_EXTENSION)` – medilies Oct 08 '22 at 11:05

score 25 · Answer 2 · answered Sep 27 '11 at 02:49

25

$info = pathinfo($pathtofile);
if ($info["extension"] == "jpg") { .... }

answered Sep 27 '11 at 02:49

Alon Eitan

11,997
8
49
58

I've used this code on a section of my website. However, when executing it along with `echo "$info"` it always returns the value Array. Why is this? – M Smith Apr 29 '16 at 10:39
@user2910074 This question is OLD, and I'll have you see your code in order to provide with any help. I suggest that you'll post a question here on SO – Alon Eitan Apr 30 '16 at 20:05

score 8 · Answer 3 · answered Nov 19 '17 at 16:50

For php 5.3+ you can use the SplFileInfo() class

$spl = new SplFileInfo($filename); 
print_r($spl->getExtension()); //gives extension

Also since you are checking extension for file uploads, I highly recommend using the mime type instead..

For php 5.3+ use the finfo class

$finfo = new finfo(FILEINFO_MIME);
print_r($finfo->buffer(file_get_contents($file name));

score 7 · Answer 4 · edited Sep 19 '15 at 13:42

7

$file_parts = pathinfo($filename);

$file_parts['extension'];
$cool_extensions = Array('jpg','png');

if (in_array($file_parts['extension'], $cool_extensions)){
    FUNCTION1
} else {
    FUNCTION2
}

edited Sep 19 '15 at 13:42

Miki

40,887
13
123
202

answered Nov 03 '14 at 17:52

imaginabit

409
4
9

you might want to change the order of the 'needle' and the 'haystack' in `in_array`. – CousinCocaine Aug 26 '19 at 10:19

score 3 · Answer 5 · answered Nov 23 '18 at 15:57

3

$path = 'image.jpg';
echo substr(strrchr($path, "."), 1); //jpg

answered Nov 23 '18 at 15:57

Airy

5,484
7
53
78

score 1 · Answer 6 · answered Apr 02 '13 at 10:05

1

  $original_str="this . is . to . find";
  echo "<br/> Position: ". $pos=strrpos($original_str, ".");
  $len=strlen($original_str);
  if($pos >= 0)
  {
    echo "<br/> Extension: ".   substr($original_str,$pos+1,$len-$pos) ;
   }

answered Apr 02 '13 at 10:05

Jasmeen

876
9
16

@jurchiks `this . is . to . find` is absolutely a valid file name in most operating systems. – user229044 Aug 05 '15 at 16:20

score 1 · Answer 7 · edited Feb 23 '21 at 15:47

1

$file = $_FILES["file"] ["tmp_name"]; 
$check_ext = strtolower(pathinfo($file,PATHINFO_EXTENSION));
if ($check_ext == "fileext") {
    //code
}
else { 
    //code
}

edited Feb 23 '21 at 15:47

D. Schreier

1,700
1
22
34

answered Apr 14 '19 at 14:12

GeniusGeek

315
6
14

PHP check file extension

7 Answers7

Linked

Related