How do you remove hard coded thumbnail image dimensions?

How can I remove the width and height attributes from the post_thumbnail when inserting with <?php the_post_thumbnail(); ?>?

<img width="800" height="533" src="" class="attachment-post-thumbnail wp-post-image" />


Related: Filter to remove image dimension attributes?

There’s a filter on post_thumbnail_html which receives as its argument the full html element representing the post thumbnail image before it’s echoed to the page. You can filter out the dimensions with a bit of regex:

add_filter( 'post_thumbnail_html', 'remove_thumbnail_dimensions', 10, 3 );

function remove_thumbnail_dimensions( $html, $post_id, $post_image_id ) {
    $html = preg_replace( '/(width|height)=\"\d*\"\s/', "", $html );
    return $html;

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