$file = '/path/to/file/filename.ext';
$file_name = pathinfo($file, PATHINFO_FILENAME); // returns "filename" 
 

$pFile = (object) pathinfo('/path/to/file/filename.ext');

printf("Directory: %s<br />\n", $pFile->dirname);
printf("Base: %s<br />\n", $pFile->basename);
printf("Extension: %s<br />\n", $pFile->extension);
printf("Filename: %s<br />\n", $pFile->filename);