src/includes/classes/Core/Utils/Nonce.php
public function input(string $action = null, callable $callback = null): string
    {
        $token = $this->create($action, $callback);
        return '<input type="hidden" name="_nonce" value="'.$this->c::escAttr($token).'" />';
    }
public function input(string $action = null, callable $callback = null): string
    {
        $token = $this->create($action, $callback);
        return '<input type="hidden" name="_nonce" value="'.$this->c::escAttr($token).'" />';
    }
Nonce input markup.

@since 17xxxx Nonce utils.

@param string|null   $action   Action.
@param callable|null $callback Callback.

@return string Hidden input field with `_nonce` token.
See also: {@link create()}