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

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<?php

/**
 * Abstract class representing Definition cache managers that implements
 * useful common methods and is a factory.
 * @todo Create a separate maintenance file advanced users can use to
 *       cache their custom HTMLDefinition, which can be loaded
 *       via a configuration directive
 * @todo Implement memcached
 */
abstract class HTMLPurifier_DefinitionCache
{
    /**
     * @type string
     */
    public $type;

    /**
     * @param string $type Type of definition objects this instance of the
     *      cache will handle.
     */
    public function __construct($type)
    {
        $this->type = $type;
    }

    /**
     * Generates a unique identifier for a particular configuration
     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
     * @return string
     */
    public function generateKey($config)
    {
        return $config->version . ',' . // possibly replace with function calls
               $config->getBatchSerial($this->type) . ',' .
               $config->get($this->type . '.DefinitionRev');
    }

    /**
     * Tests whether or not a key is old with respect to the configuration's
     * version and revision number.
     * @param string $key Key to test
     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config to test against
     * @return bool
     */
    public function isOld($key, $config)
    {
        if (substr_count($key, ',') < 2) {
            return true;
        }
        list($version, $hash, $revision) = explode(',', $key, 3);
        $compare = version_compare($version, $config->version);
        // version mismatch, is always old
        if ($compare != 0) {
            return true;
        }
        // versions match, ids match, check revision number
        if ($hash == $config->getBatchSerial($this->type) &&
            $revision < $config->get($this->type . '.DefinitionRev')) {
            return true;