removing 3 and 4 character extensions

[jds580s]

I've been working from the online manual, a few tutorials, and this web site but have a problem I haven't been able to get around.

I'm trying to remove the extension from file names. Currently I have $allphotos = substr($entry, 0, -4); doing the job, but obviously this will only remove three letter extensions and not .jpeg or .html or .script etc...

I've searched the manual forums and google but didn't find a solution I was able to apply in this instance.

Is there a good solution for removing perhaps everything after and including the last period in a filename? Is there an easier solution?

Additionally this is one of my first php scripts and I'm sure someone might have a ideas on how to refine it.

Here is the basic task:
1. Read all file names in a directory and all subdirectories
2. remove all but .php or .html
3. put the path in variable $path file name in $file and drop the extension
4. compare $file to a text file containing a list of file names if it's a match echo some html back

Here's what I have:
<?php
$d = dir("..");
treewalk($d);
$d->close();

function treewalk($t)
{
while($entry=$t->read())
{
if (($entry != '.') && ($entry != '..') && ($entry != 'UserSelections.txt'))
{
if (is_dir($t->path . "/" . $entry))
{
$d = dir($t->path . "/" . $entry);
treewalk($d);
$d->close();
}
if (eregi(".php|.html", $entry))
{
$tempfolder = $t->path . "/" . $entry;
$allphotos = substr($entry, 0, -4);
$folder = dirname($tempfolder) . "/";

	$filename = 'top100.txt';
	$fp = fopen($filename, "r");

	$top100photos = fread($fp, filesize($filename)); 
	fclose($fp);

	$file = substr($entry, 0, -4);

	if (eregi($allphotos, $top100photos)) {
	   echo ("<p><a href=\"$folder$file.php\" target=\"RightFrame\"><IMG src=\"$folder../thumbnails/$file.jpg\" border=\"1\" alt=\"$file\" align=\"BOTTOM\"></a></p>");
	} else {
		}
	  }
         }
    }

}
?>

Thanks for any help!

Justin

[osusano]

try it doing like this

list($filename, $extension) = split (".",$filename);

this is just to seperate the filename to ext. so bascially if u have a file with the filename of file.name.tar.gz the $extions is name so its up to you to decide how u wanna work on this.

[laserlight]

if you use that method, then you would have to take the last element of the array, and ensure that the array has more than 1 element.

[Shawn_Jetton]

This is what you are looking. strrpos(string reverse Position) will grab the first "." from the RIGHT. Which will always be your extention..

<?PHP
$filename = "Thisisthefilename.html";
$pos = strrpos($filename, ".");
$new_filename = substr($filename, 0, $pos);
echo $new_filename;
?>