Define mobile device in a widget

Text widgets are for plain text and HTML markup only..

You could create a shortcode, adding this to your child theme’s functions file:

function my_mobile_widget( $atts ) {

	$a = shortcode_atts( array(
        'content' => ''
    ), $atts );

	ob_start();

	if ( wp_is_mobile() ) // when using a mobile browser, echo the content
		echo "{$a['content']}";

	return ob_get_clean();
}
add_shortcode( 'my-mobile-widget', 'my_mobile_widget' );
// if your text widgets don't output shortcodes contents
add_filter('widget_text', 'do_shortcode');

Now put this test shortcode in a new text widget:

[my-mobile-widget content="<p><b>Hello</b> there! Thanks for <i>visiting!!</i></p>"]

Update content attribute to what you need, and let us know how it goes

Just add an else right after the wp_is_mobile condition, like:

if ( wp_is_mobile() ) // when using a mobile browser, echo the content
	echo "{$a['content']}";
else // when in desktop
	echo "something else, not in mobile";

Watch out for syntax errors.

You can also set additional attributes for desktop:

function my_mobile_widget( $atts ) {

	$a = shortcode_atts( array(
        'mobile' => '',
        'desktop' => ''
    ), $atts );

	ob_start();

	if ( wp_is_mobile() ) // when using a mobile browser, echo the content
		echo "{$a['mobile']}";
	else
		echo "{$a['desktop']}";

	return ob_get_clean();
}
add_shortcode( 'my-mobile-widget', 'my_mobile_widget' );

[my-mobile-widget mobile="<p>You are browsing this site on mobile</p>" desktop="<p>You are browsing this site on dekstop</p>"]

Hope it worked for you, you are welcome 🙂 !

Awesome!! Glad to hear it worked for you!

Mark as resolved, and have a nice day 🙂