set_post_thumbnail_size in percent, not pixels?

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I’ve created a new custom post type and I need the post thumbnails or featured images generated by the get_the_post_thumbnail() function to be set in percent, rather than pixels, as I’m using a fluid grid. Ideally I would only set the width (to 100%). Is there a way to do this? Potentially using add_image_size()?

3 Answers
3

have you tried,

if(has_post_thumbnail()) {                    
    $image_src = wp_get_attachment_image_src( get_post_thumbnail_id(),'full' );
     echo '<img src="' . $image_src[0]  . '" width="100%"  />';
}

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