Adicionar nome de classe para postar miniatura

Sim - vocêpodepassarna aula que você deseja usarpara the_post_thumbnail() comoparte do argumento de atributos,porexemplo <?php the_post_thumbnail('thumbnail', array('class' => 'your-class-name')); ?>

ref: http://codex.wordpress.org/function_reference/the_post_thumbnail#styling_post_thumbnails

Yep - you can pass the class you want to use to the_post_thumbnail() as part of the attributes argument, for example <?php the_post_thumbnail('thumbnail', array('class' => 'your-class-name')); ?>

Ref: http://codex.wordpress.org/Function_Reference/the_post_thumbnail#Styling_Post_Thumbnails

Vocêpodefiltraressas classes.

 function alter_attr_wpse_102158($attr) {
  remove_filter('wp_get_attachment_image_attributes','alter_attr_wpse_102158');
  $attr['class'] .= ' new-class';
  return $attr;
}
add_filter('wp_get_attachment_image_attributes','alter_attr_wpse_102158'); 
 

Adicione ofiltro antes de ligar the_post_thumbnail.Ofiltro se removerá automaticamente.

É umpouco de caminhadapara chegar lá,mas the_post_thumbnail usa get_the_post_thumbnail que usa wp_get_attachment_image Aplicaessefiltro.

You can filter those classes.

function alter_attr_wpse_102158($attr) {
  remove_filter('wp_get_attachment_image_attributes','alter_attr_wpse_102158');
  $attr['class'] .= ' new-class';
  return $attr;
}
add_filter('wp_get_attachment_image_attributes','alter_attr_wpse_102158'); 

Add the filter just before you call the_post_thumbnail. The filter will remove itself automatically.

It is a bit of trek to get there but the_post_thumbnail uses get_the_post_thumbnail which uses wp_get_attachment_image which applies that filter.

Suamarca deimagemnãotem aula você acabou deescrevereste código <?php the_post_thumbnail(); ?>mas suatag deimagemtem aula você acabou deescrevereste código

 <?php the_post_thumbnail('thumbnail', array(
'class' => 'class_name'

)); ?>
 

Your image tag have no class you just write this code <?php the_post_thumbnail(); ?> but your image tag have class you just write this code

<?php the_post_thumbnail('thumbnail', array(
'class' => 'class_name'

)); ?>