function _wp_post_thumbnail_class_filter( $attr ) {}

Adds a ‘wp-post-image’ class to post thumbnails Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to dynamically add/remove itself so as to only filter post thumbnails


  • array $attr: Attributes including src, class, alt, title

Source code

function _wp_post_thumbnail_class_filter( $attr ) {

	$attr['class'] .= ' wp-post-image';

	return $attr;



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