vendor/ezyang/htmlpurifier/library/HTMLPurifier/PropertyList.php

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<?php

/**
 * Generic property list implementation
 */
class HTMLPurifier_PropertyList
{
    /**
     * Internal data-structure for properties.
     * @type array
     */
    protected $data = array();

    /**
     * Parent plist.
     * @type HTMLPurifier_PropertyList
     */
    protected $parent;

    /**
     * Cache.
     * @type array
     */
    protected $cache;

    /**
     * @param HTMLPurifier_PropertyList $parent Parent plist
     */
    public function __construct($parent = null)
    {
        $this->parent = $parent;
    }

    /**
     * Recursively retrieves the value for a key
     * @param string $name
     * @throws HTMLPurifier_Exception
     */
    public function get($name)
    {
        if ($this->has($name)) {
            return $this->data[$name];
        }
        // possible performance bottleneck, convert to iterative if necessary
        if ($this->parent) {
            return $this->parent->get($name);
        }
        throw new HTMLPurifier_Exception("Key '$name' not found");
    }

    /**
     * Sets the value of a key, for this plist
     * @param string $name
     * @param mixed $value
     */
    public function set($name, $value)
    {
        $this->data[$name] = $value;
    }