$val) {
        if(is_array($val)) {
            $res[] = "[$key]";
            foreach($val as $skey => $sval) $res[] = "$skey = ".(is_numeric($sval) ? $sval : '"'.$sval.'"');
        }
        else $res[] = "$key = ".(is_numeric($val) ? $val : '"'.$val.'"');
    }
    if(safefilerewrite($file, implode("\r\n", $res))) {
        return true;
    } else {
        return false;
    }
}
function safefilerewrite($fileName, $dataToSave) {
    if ($fp = fopen($fileName, 'w')) {
        $startTime = microtime(TRUE);
        do {
            $canWrite = flock($fp, LOCK_EX);
            // If lock not obtained sleep for 0 - 100 milliseconds, to avoid collision and CPU load
            if(!$canWrite) usleep(round(rand(0, 100)*1000));
        } while ((!$canWrite)and((microtime(TRUE)-$startTime) < 5));
        //file was locked so now we can store information
        if ($canWrite) {
            fwrite($fp, $dataToSave);
            flock($fp, LOCK_UN);
        }
        fclose($fp);
        return true;
    } else {
        return false;
    }
}
/**
*
* Add CSRF Token to form
*
*/
function CSRFToken() {
?>
' , PHP_EOL;
  foreach ( $options as $opt => $label) {
    $select = '';
    $key = isAssoc($options) ? $opt : $label;
    if( $key == $selected ) {
      $select = ' selected="selected"';
    }
    echo '' , PHP_EOL;
  }
  echo '' , PHP_EOL;
}
/**
*
* @param string $input
* @param string $string
* @param int $offset
* @param string $separator
* @return $string
*/
function GetDistString( $input,$string,$offset,$separator ) {
	$string = substr( $input,strpos( $input,$string )+$offset,strpos( substr( $input,strpos( $input,$string )+$offset ), $separator ) );
	return $string;
}
/**
*
* @param array $arrConfig
* @return $config
*/
function ParseConfig( $arrConfig ) {
	$config = array();
	foreach( $arrConfig as $line ) {
		$line = trim($line);
		if( $line != "" && $line[0] != "#" ) {
			$arrLine = explode( "=",$line );
			$config[$arrLine[0]] = ( count($arrLine) > 1 ? $arrLine[1] : true );
		}
	}
	return $config;
}
/**
*
* @param string $freq
* @return $channel
*/
function ConvertToChannel( $freq ) {
  if ($freq >= 2412 && $freq <= 2484) {
    $channel = ($freq - 2407)/5;
  } elseif ($freq >= 4915 && $freq <= 4980) {
    $channel = ($freq - 4910)/5 + 182;
  } elseif ($freq >= 5035 && $freq <= 5865) {
    $channel = ($freq - 5030)/5 + 6;
  } else {
    $channel = -1;
  }
  if ($channel >= 1 && $channel <= 196) {
    return $channel;
  } else {
    return 'Invalid Channel';
  }
}
/**
* Converts WPA security string to readable format
* @param string $security
* @return string
*/
function ConvertToSecurity( $security ) {
  $options = array();
  preg_match_all('/\[([^\]]+)\]/s', $security, $matches);
  foreach($matches[1] as $match) {
    if (preg_match('/^(WPA\d?)/', $match, $protocol_match)) {
      $protocol = $protocol_match[1];
      $matchArr = explode('-', $match);
      if (count($matchArr) > 2) {
        $options[] = htmlspecialchars($protocol . ' ('. $matchArr[2] .')', ENT_QUOTES);
      } else {
        $options[] = htmlspecialchars($protocol, ENT_QUOTES);
      }
    }
  }
  if (count($options) === 0) {
    // This could also be WEP but wpa_supplicant doesn't have a way to determine
    // this.
    // And you shouldn't be using WEP these days anyway.
    return 'Open';
  } else {
    return implode('
', $options);
  }
}
/**
*
*
*/
function DisplayOpenVPNConfig() {
	exec( 'cat '. RASPI_OPENVPN_CLIENT_CONFIG, $returnClient );
	exec( 'cat '. RASPI_OPENVPN_SERVER_CONFIG, $returnServer );
	exec( 'pidof openvpn | wc -l', $openvpnstatus);
	if( $openvpnstatus[0] == 0 ) {
		$status = '