As referenced in this post, some would like the ability to remove or customize the class attribute in the media manager.
Recommended solution is to add a new filter called 'image_class' to the 'get_image_tag' function in '/wp-includes/media.php'.
Before:
function get_image_tag($id, $alt, $title, $align, $size='medium') {
list( $img_src, $width, $height ) = image_downsize($id, $size);
$hwstring = image_hwstring($width, $height);
$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id.'" />';
$url = '';
$html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url, $size );
return $html;
}
After:
function get_image_tag($id, $alt, $title, $align, $size='medium') {
list( $img_src, $width, $height ) = image_downsize($id, $size);
$hwstring = image_hwstring($width, $height);
$class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id;
$class = apply_filters('image_class', $class, $id, $align, $size);
$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="'.$class.'" />';
$html = apply_filters( 'image_send_to_editor', $html, $id, $alt, $title, $align, $url );
return $html;
}
Code changed is here:
$class = 'align'.attribute_escape($align).' size-'.attribute_escape($size).' wp-image-'.$id;
$class = apply_filters('image_class', $class, $id, $align, $size);
$html = '<img src="'.attribute_escape($img_src).'" alt="'.attribute_escape($alt).'" title="'.attribute_escape($title).'" '.$hwstring.'class="'.$class.'" />';
