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<?php
namespace Drupal\Core\Template;
use Drupal\Component\Utility\Html;
/**
* A class that defines a type of boolean HTML attribute.
*
* Boolean HTML attributes are not attributes with values of TRUE/FALSE.
* They are attributes that if they exist in the tag, they are TRUE.
* Examples include selected, disabled, checked, readonly.
*
* To set a boolean attribute on the Attribute class, set it to TRUE.
* @code
* $attributes = new Attribute();
* $attributes['disabled'] = TRUE;
* echo '<select' . $attributes . '/>';
* // produces <select disabled>;
* $attributes['disabled'] = FALSE;
* echo '<select' . $attributes . '/>';
* // produces <select>;
* @endcode
*
* @see \Drupal\Core\Template\Attribute
*/
class AttributeBoolean extends AttributeValueBase {
/**
* {@inheritdoc}
*/
public function render() {
return $this->__toString();
}
/**
* Implements the magic __toString() method.
*/
public function __toString() {
return $this->value === FALSE ? '' : Html::escape($this->name);
}
}