WordPress at a glance
filter is not described

image_send_to_editor_url filter-hook . WP 2.8.0

Filters the image URL sent to the editor.

Usage

add_filter( 'image_send_to_editor_url', 'filter_function_name_127', 10, 4 );
function filter_function_name_127( $html, $src, $alt, $align ){
	// filter...

	return $html;
}
$html(string)
HTML markup sent to the editor for an image.
$src(string)
Image source URL.
$alt(string)
Image alternate, or alt, text.
$align(string)
The image alignment. Possible values include 'alignleft', 'aligncenter', 'alignright', 'alignnone'.
Default: 'alignnone'

Where the hook is called

wp_media_upload_handler()
wp-admin/includes/media.php 821
$html = apply_filters( 'image_send_to_editor_url', $html, esc_url_raw( $src ), $alt, $align );

Where the hook is used (in WP core)

Does not used.