class AttributeArray in Drupal 10

A class that defines a type of Attribute that can be added to as an array.

To use with Attribute, the array must be specified. Correct:

$attributes = new Attribute();
$attributes['class'] = array();
$attributes['class'][] = 'cat';

Incorrect:

$attributes = new Attribute();
$attributes['class'][] = 'cat';

Hierarchy

• class \Drupal\Core\Template\AttributeArray extends \Drupal\Core\Template\AttributeValueBase implements \Drupal\Core\Template\ArrayAccess, \Drupal\Core\Template\IteratorAggregate

See also

\Drupal\Core\Template\Attribute

1 file declares its use of AttributeArray

AttributeTest.php in core/tests/Drupal/Tests/Core/Template/AttributeTest.php

File

core/lib/Drupal/Core/Template/AttributeArray.php, line 25

Namespace

Drupal\Core\Template

class AttributeArray extends AttributeValueBase implements \ArrayAccess, \IteratorAggregate {

  /**
   * Ensures empty array as a result of array_filter will not print '$name=""'.
   *
   * @see \Drupal\Core\Template\AttributeArray::__toString()
   * @see \Drupal\Core\Template\AttributeValueBase::render()
   */
  const RENDER_EMPTY_ATTRIBUTE = FALSE;

  /**
   * {@inheritdoc}
   */

  #[\ReturnTypeWillChange]
  public function offsetGet($offset) {
    return $this->value[$offset];
  }

  /**
   * {@inheritdoc}
   */

  #[\ReturnTypeWillChange]
  public function offsetSet($offset, $value) {
    if (isset($offset)) {
      $this->value[$offset] = $value;
    }
    else {
      $this->value[] = $value;
    }
  }

  /**
   * {@inheritdoc}
   */

  #[\ReturnTypeWillChange]
  public function offsetUnset($offset) {
    unset($this->value[$offset]);
  }

  /**
   * {@inheritdoc}
   */

  #[\ReturnTypeWillChange]
  public function offsetExists($offset) {
    return isset($this->value[$offset]);
  }

  /**
   * Implements the magic __toString() method.
   */
  public function __toString() {

    // Filter out any empty values before printing.
    $this->value = array_unique(array_filter($this->value));
    return Html::escape(implode(' ', $this->value));
  }

  /**
   * {@inheritdoc}
   */

  #[\ReturnTypeWillChange]
  public function getIterator() {
    return new \ArrayIterator($this->value);
  }

  /**
   * Exchange the array for another one.
   *
   * @see ArrayObject::exchangeArray
   *
   * @param array $input
   *   The array input to replace the internal value.
   *
   * @return array
   *   The old array value.
   */
  public function exchangeArray($input) {
    $old = $this->value;
    $this->value = $input;
    return $old;
  }

}