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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\View\Helper;
use Zend\View\Exception\InvalidArgumentException;
use Zend\View\Helper\Placeholder\Container;
/**
* Helper for passing data between otherwise segregated Views. It's called
* Placeholder to make its typical usage obvious, but can be used just as easily
* for non-Placeholder things. That said, the support for this is only
* guaranteed to effect subsequently rendered templates, and of course Layouts.
*/
class Placeholder extends AbstractHelper
{
/**
* Placeholder items
*
* @var array
*/
protected $items = [];
/**
* Default container class
* @var string
*/
protected $containerClass = 'Zend\View\Helper\Placeholder\Container';
/**
* Placeholder helper
*
* @param string $name
* @throws InvalidArgumentException
* @return Placeholder\Container\AbstractContainer
*/
public function __invoke($name = null)
{
if ($name === null) {
throw new InvalidArgumentException(
'Placeholder: missing argument. $name is required by placeholder($name)'
);
}
$name = (string) $name;
return $this->getContainer($name);
}
/**
* createContainer
*
* @param string $key
* @param array $value
* @return Container\AbstractContainer
*/
public function createContainer($key, array $value = [])
{
$key = (string) $key;
$this->items[$key] = new $this->containerClass($value);
return $this->items[$key];
}
/**
* Retrieve a placeholder container
*
* @param string $key
* @return Container\AbstractContainer
*/
public function getContainer($key)
{
$key = (string) $key;
if (isset($this->items[$key])) {
return $this->items[$key];
}
$container = $this->createContainer($key);
return $container;
}
/**
* Does a particular container exist?
*
* @param string $key
* @return bool
*/
public function containerExists($key)
{
$key = (string) $key;
$return = array_key_exists($key, $this->items);
return $return;
}
}