mysql: Error while executing group action [solved]

While installing XAMPP for Linux 7.2.13 on Puppy Linux, I received the following errors:

"mysql: Error while executing group action"

"Problem running post-install step. Installation may not compllete correctly
Error running chown -R root:mysql /opt/lampp/var/mysql:
chown: unknow user/group root:mysql"

Seem that Xampp installer cannot create user "mysql" on Puppy Linux. So i create "mysql" user manual, re install XAMPP.
It work for me :).

To create user in Puppy Linux, open Terminal and type:

"adduser mysql"

How to add new currency to LearnPress

To add new currency to LearnPress, you need add bellow code to functions.php file in your WordPress theme

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# add currency in to LearnPress 

add_filter('learn_press_get_payment_currencies', 'my_cbf_learn_press_get_payment_currencies', 10, 1 ); // for LearnPress 2
add_filter('learn-press/currencies', 'my_cbf_learn_press_get_payment_currencies', 10, 1 ); // for LearnPress 3

function my_cbf_learn_press_get_payment_currencies( $currencies ){

    $currency_new = 'MCR'; # Currency Code

    $currency_name = __('My Currency (MCR)', 'learnpress'); # Full name of Currency    

    if( !isset($currencies[$currency_new]) || ( isset($currencies[$currency_new]) && $currencies[$currency_new] !== $currency_name ) ) {

        $currencies[$currency_new] = $currency_name;

    }

    return $currencies;

}

add_filter( 'learn_press_currency_symbol', 'my_cbf_learn_press_currency_symbol', 10, 2 );

function my_cbf_learn_press_currency_symbol( $currency_symbol, $currency ) {

    $currency_new = 'MCR'; # Currency Code

    if( $currency == $currency_new ) {

        $currency_symbol = '<i class="fa fa-thumbs-up"></i>'; # Symbol of currency

    }

    return $currency_symbol;

}

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