如果metabox为空，则按钮隐藏

Question

I want the button hide when it is empty remain unfortunately only the HTML before, even though the button is already empty, how can I rewrite the code so the button is hidden?

function cspm_infobox_content(){
        $telnr = get_post_meta( $post_id, 'telnr', true );

        $email = get_post_meta( $post_id, 'email', true );

  .........
 elseif($infobox_type == 'cspm_type5'){

                $output .= '<div class="cspm_infobox_content">';
                    $output .= '<div>';
                        $output .= '<div class="telnr"><a class="wm-button color-read" href="tel:'.$telnr.'"><img src="Phone-18-18-dimenzionet.png" height="18" width="18"></a>';
                                                $output .= '<a class="wm-button color-blue email" href="mailto:'.$email.'"><img src="email-ico.png" height="18" width="18"></a></div>';

Answer 1

I don't understand your question correctly . Can you provide the detail code.

I think you should use

if($infobox_type!= ''){

// show th button .
}