PHP : Why we are using " if (($fname != '.') && ($fname != '..'))

[Hixwraryday]

Why we are using " if (($fname != '.') && ($fname != '..')) " in this code... Is using to find the file format is Windows or linux or mac ?\[code\]if (is_dir( "{$dir}/{$fname}" )) { if (($fname != '.') && ($fname != '..')) { echo "<u>Deleting Files in the Directory</u>: {$dir}/{$fname} <br />"; deleteDir("$dir/$fname"); } }\[/code\]