strrpos and substr

[corillo181]

this code changes the name of a uploading file

but i dont know how it works can someone explaing it to me? i tried php.net but is not making sense .


[code]
$genre=$_POST['genre'];
$filename = $_FILES['sfile']['name'];
$pos = strrpos($filename, '.');
$newname = $song . substr($filename, $pos);
[/code]

[willfitch]

Yes.

The strrpos finds the position of the last occurance of a string and returns that value as an integer.  substr truncates a string at position x (and y if specified).  Like so:

File Name: myfile.mpeg
$pos = strrpos('myfile.mpeg','.'); // returns 6 (6th position)
substr('myfile.mpeg',$pos); // removes everything except .mpeg

Do you understand?

[corillo181]

yes!
that's a clear answer, thank you.