PHP 8 introduced breaking change to call_user_func_array()

[jairoprez]

See https://bugs.php.net/bug.php?id=80531.

That function is being used here https://github.com/brightnucleus/shortcodes/blob/master/src/ShortcodeManager.php#L383 and it is causing the Unknown named parameter error in a project where this component for shortcodes is being used.

Solution: passing the second parameter to call_user_func_array() through array_values() so that it doesn't have keys that would be treated as named parameters.

if ( is_callable( $class ) ) {
    $class = call_user_func_array( $class, array_values( $args ) );
}