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

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<?php

/**
 * Configuration object that triggers customizable behavior.
 *
 * @warning This class is strongly defined: that means that the class
 *          will fail if an undefined directive is retrieved or set.
 *
 * @note Many classes that could (although many times don't) use the
 *       configuration object make it a mandatory parameter.  This is
 *       because a configuration object should always be forwarded,
 *       otherwise, you run the risk of missing a parameter and then
 *       being stumped when a configuration directive doesn't work.
 *
 * @todo Reconsider some of the public member variables
 */
class HTMLPurifier_Config
{

    /**
     * HTML Purifier's version
     * @type string
     */
    public $version = '4.9.2';

    /**
     * Whether or not to automatically finalize
     * the object if a read operation is done.
     * @type bool
     */
    public $autoFinalize = true;

    // protected member variables

    /**
     * Namespace indexed array of serials for specific namespaces.
     * @see getSerial() for more info.
     * @type string[]
     */
    protected $serials = array();

    /**
     * Serial for entire configuration object.
     * @type string
     */
    protected $serial;

    /**
     * Parser for variables.
     * @type HTMLPurifier_VarParser_Flexible
     */
    protected $parser = null;

    /**
     * Reference HTMLPurifier_ConfigSchema for value checking.
     * @type HTMLPurifier_ConfigSchema
     * @note This is public for introspective purposes. Please don't
     *       abuse!
     */
    public $def;