Here is an easy way of calculating the time elapsed during some script execution in PHP, using microtime() :

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$exec_start = microtime(true); // 'true' returns the seconds of type double



// ... do stuff



echo (microtime(true) - $exec_start) . ' seconds';

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$files = array();

$path = getcwd();

$supported_ext = array('gif', 'jpg', 'jpeg');

$dir = @opendir($path);



while ($file = @readdir($dir)){

      if (!is_dir($path.$file)){

            $splitted = explode('.', $file);

            $ext = strtolower($splitted[count($splitted)-1]);

            if (in_array($ext, $supported_ext)) $files[] = $file;

      }

}



@closedir($dir);

sort($files);



for ($i=0; $i<count($files); $i++){

      $output .= '<img alt="'.$files[$i].'" src="'.$files[$i].'" height="16" width="16" />';

}



echo $output;

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function writeFile($data, $path, $targetname){

    $fp = fopen($path.'/'.$targetname, "w", 0);

    fputs($fp, $data);

    fclose($fp);

}