Verifying music link extensions

[Porl123]

is it possible to read the extension of an audio file without using substr()? I'm trying not to use that seeing though it can have problems in some areas. if anyone can point me to some functions or knows any methods i'd be greatful, thanks people!

[.josh]

what's wrong with using substr?

 

anyways...you could always explode at the dot and look at the 2nd element of the returned array

[premiso]

Another route:

 

pathinfo with the 2nd parameter (if your version supports it) of PATHINFO_EXTENSION

[Porl123]

Ah that's the problem, it's an external link

[coalgames]

I dont get why you dont want to use substr() function.

 

You could use regular expressions to get extension of the file.

 

But, if you dont want to use substr() here is a way to do it

 

$filename = 'something.wav';
$fl = strlen($filename); // File length
$fileextension = $filename[$fl] . $filename[($fl-1)] . $filename[($fl-2)];
if ( $fileextension == 'wav' ) {
echo 'Valid file extension';
}

 

The downside to this is that the person could just change the extension of the file with a malicious exe inside.

[.josh]

I dont get why you dont want to use substr() function.

 

You could use regular expressions to get extension of the file.

 

But, if you dont want to use substr() here is a way to do it

 

$filename = 'something.wav';
$fl = strlen($filename); // File length
$fileextension = $filename[$fl] . $filename[($fl-1)] . $filename[($fl-2)];
if ( $fileextension == 'wav' ) {
echo 'Valid file extension';
}

 

The downside to this is that the person could just change the extension of the file with a malicious exe inside.

 

I don't know why on earth someone would choose that over substr but regardless, you made a small fubar in judgement.  strlen returns length of string but elements start at 0 not 1 so it would be $fl-1,$fl-2,$fl-3 not $fl,$f-1,$fl-2

[coalgames]

Oh ok thanks for the correction.

 

Yeah, substr is way easier.

 

substr((strlen($file))-1,-0);

 

But I think pathinfo is the easiest.

[.josh]

lol umm you fubared your math again...and besides that, you're over-complicating it...

 

substr($file,-3);