(PHP 5)
DirectoryIterator::isFile — Determine if current DirectoryIterator item is a regular file
Determines if the current DirectoryIterator item is a regular file.
This function has no parameters.
   Returns TRUE if the file exists and is a regular file 
   (not a link or dir), 
   otherwise FALSE
  
Example #1 DirectoryIterator::isFile() example
This example will list all regular files in the directory containing the script.
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
foreach ($iterator as $fileinfo) {
    if ($fileinfo->isFile()) {
        echo $fileinfo->getFilename() . "\n";
    }
}
?>
The above example will output something similar to:
apple.jpg banana.jpg example.php pears.jpg