get_image_tag_class filter-hook . WP 2.6.0

Filters the value of the attachment's image tag class attribute.

Usage

add_filter( 'get_image_tag_class', 'filter_function_name_2876', 10, 4 );
function filter_function_name_2876( $class, $id, $align, $size ){
	// filter...

	return $class;
}

$class(string)

CSS class name or space-separated list of classes.

$id(int)

Attachment ID.

$align(string)

Part of the class name for aligning the image.

$size(string/array)

Size of image. Image size or array of width and height values (in that order).
Default: 'medium'

Where the hook is called

$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

Where the hook is used (in WP core)