(PHP 5 <= 5.1.1)
DirectoryIterator::isLink — Returns true if file is symbolic link
This function is currently not documented; only its argument list is available.
Checks if the current element is a symbolic link.
This function has no parameters.
TRUE if the entry is a symbolic link, otherwise FALSE
Example #1 A DirectoryIterator::isLink example
This example contains a recursive function for removing a directory tree.
<?php
/**
 * This function will recursively delete all files in the given path, without
 * following symlinks.
 * 
 * @param string $path Path to the directory to remove.
 */
function removeDir($path) {
    $dir = new DirectoryIterator($path);
    foreach ($dir as $fileinfo) {
        if ($fileinfo->isFile() || $fileinfo->isSymlink()) {
            unlink($fileinfo->getPathName());
        } elseif (!$fileinfo->isDot() && $fileinfo->isDir()) {
            removeDir($fileinfo->getPathName());
        }
    }
    rmdir($path);
}
removeDir('foo');
?>