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Get File Last Updated Date

/*
 * @param string $file Filepath
 * @param string $format dateformat
 * @link http://www.php.net/manual/de/function.date.php
 * @link http://www.php.net/manual/de/function.filemtime.php
 * @return string|bool Date or Boolean
 */

function getFiledate($file, $format) {
       if (is_file($file)) {
               $filePath = $file;
               if (!realpath($filePath)) {
                       $filePath = $_SERVER["DOCUMENT_ROOT"].$filePath;
       }
               $fileDate = filemtime($filePath);
               if ($fileDate) {
                       $fileDate = date("$format",$fileDate);
                       return $fileDate;
               }
               return false;
       }
       return false;
}