WordPress at a glance
function is not described

image_link_input_fields() WP 2.7.0

Retrieve HTML for the Link URL buttons with the default link type as specified.

No Hooks.

Return

String.

Usage

image_link_input_fields( $post, $url_type );
$post(WP_Post) (required)
$url_type(string)

Default: ''

Code of image link input fields: wp-admin/includes/media.php WP 5.2.2

<?php
function image_link_input_fields( $post, $url_type = '' ) {

	$file = wp_get_attachment_url( $post->ID );
	$link = get_attachment_link( $post->ID );

	if ( empty( $url_type ) ) {
		$url_type = get_user_setting( 'urlbutton', 'post' );
	}

	$url = '';
	if ( $url_type == 'file' ) {
		$url = $file;
	} elseif ( $url_type == 'post' ) {
		$url = $link;
	}

	return "
	<input type='text' class='text urlfield' name='attachments[$post->ID][url]' value='" . esc_attr( $url ) . "' /><br />
	<button type='button' class='button urlnone' data-link-url=''>" . __( 'None' ) . "</button>
	<button type='button' class='button urlfile' data-link-url='" . esc_attr( $file ) . "'>" . __( 'File URL' ) . "</button>
	<button type='button' class='button urlpost' data-link-url='" . esc_attr( $link ) . "'>" . __( 'Attachment Post URL' ) . '</button>
';
}