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function wp_ajax_send_password_reset() {

	// Validate the nonce for this action.
	$user_id = isset( $_POST['user_id'] ) ? (int) $_POST['user_id'] : 0;
	check_ajax_referer( 'reset-password-for-' . $user_id, 'nonce' );

	// Verify user capabilities.
	if ( ! current_user_can( 'edit_user', $user_id ) ) {
		wp_send_json_error( __( 'Cannot send password reset, permission denied.' ) );
	}

	// Send the password reset link.
	$user    = get_userdata( $user_id );
	$results = retrieve_password( $user->user_login );

	if ( true === $results ) {
		wp_send_json_success(
			/* translators: %s: User's display name. */
			sprintf( __( 'A password reset link was emailed to %s.' ), $user->display_name )
		);
	} else {
		wp_send_json_error( $results->get_error_message() );
	}
}