shortcode display metainformation as linked image

Question

I am trying to make this shortcode to display a self made meta field called qrbase_code_pass_url as a linked image. The image should be static, but should get the dynamic URL from the meta field of the current user.

This is what I've got so far.

function get_qr_image() {
        global $current_user; // get current user's information
        get_currentuserinfo();
        $qr_url = get_currentuserinfo($current_user->qrbase_code_pass_url,24 );

        return '<a href="'. $qr_url . '"><img src="https://medlem.nexusesport.no/wp-content/uploads/2018/08/add-to-apple-wallet-logo.png"></a>';
}
add_shortcode('get_user_qr', 'get_qr_image');

This shortcode only break the page.

Thank you for all input!

Answer 1

@WebElaine is correct. I had to use the wp_get_current_user(); and remove global.

This is what worked for me

function download_to_wallet() {
        $current_user = wp_get_current_user(); // get current user's information
        $qr_url = $current_user->qrbase_code_pass_url;

        return '<a href="'. $qr_url . '"><img class="qr_download" src="https://example.com/wp-content/uploads/2018/08/add-to-apple-wallet-logo.png" style="width:200px;"></a>';
}