ilDashboardAppEventListener.php

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<?php

declare(strict_types=1);

class ilDashboardAppEventListener implements ilAppEventListener
{
    private static ?ilDBStatement $clean_up = null;

    public static function handleEvent(string $component, string $event, array $parameter): void
    {
        if ($event === 'deleteUser') {
            global $DIC;
            self::$clean_up ??= $DIC->database()->prepare(
                'DELETE FROM desktop_item WHERE user_id = ?',
                [ilDBConstants::T_INTEGER]
            );
            $DIC->database()->execute(self::$clean_up, [$parameter['usr_id']]);
        }
    }
}