Uses
| Uses | Description | 
|---|---|
| wp-includes/formatting.php: esc_url() | Checks and cleans a URL. | 
| wp-includes/link-template.php: wp_get_shortlink() | Returns a shortlink for a post, page, attachment, or site. | 
Injects rel=shortlink into the head if a shortlink is defined for the current page.
Attached to the ‘wp_head’ action.
File: wp-includes/link-template.php
function wp_shortlink_wp_head() {
	$shortlink = wp_get_shortlink( 0, 'query' );
	if ( empty( $shortlink ) ) {
		return;
	}
	echo "<link rel='shortlink' href='" . esc_url( $shortlink ) . "' />\n";
}  | Version | Description | 
|---|---|
| 3.0.0 | Introduced. | 
    © 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/functions/wp_shortlink_wp_head