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If you need for any reason to remove an extension from a filename (string) this snippet can help you. An extension in this case is everything after the last period from the whole string.

<?php
/*
Source: Bit Repository (http://www.bitrepository.com/)
*/
function remove_filename_extension($filename)
{
$extension = strrchr($filename, ".");

$filename = substr($filename, 0, -strlen($extension));

return $filename;
}

$filename = 'This-is-a-photo-description.jpeg';

$str = remove_filename_extension($filename);

echo $str;
?>

This snippet can help you to get the extension of a filename:

<?php
... some code here ...
// Filename
$filename = 'public_html/root/internet.gif';
// Extension
$ext = strrchr($filename, ".");
echo $ext; // will return ".gif"
?>