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1 efrain 1 
<?php
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namespace Aws\EndpointDiscovery;
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class EndpointList
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{
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    private $active;
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    private $expired = [];
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    public function __construct(array $endpoints)
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    {
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        $this->active = $endpoints;
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        reset($this->active);
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    }
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    /**
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     * Gets an active (unexpired) endpoint. Returns null if none found.
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     *
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     * @return null|string
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     */
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    public function getActive()
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    {
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        if (count($this->active) < 1) {
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            return null;
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        }
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        while (time() > current($this->active)) {
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            $key = key($this->active);
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            $this->expired[$key] = current($this->active);
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            $this->increment($this->active);
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            unset($this->active[$key]);
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            if (count($this->active) < 1) {
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                return null;
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            }
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        }
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        $active = key($this->active);
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        $this->increment($this->active);
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        return $active;
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    }
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    /**
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     * Gets an active endpoint if possible, then an expired endpoint if possible.
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     * Returns null if no endpoints found.
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     *
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     * @return null|string
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     */
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    public function getEndpoint()
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    {
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        if (!empty($active = $this->getActive())) {
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            return $active;
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        }
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        return $this->getExpired();
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    }
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    /**
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     * Removes an endpoint from both lists.
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     *
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     * @param string $key
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     */
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    public function remove($key)
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    {
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        unset($this->active[$key]);
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        unset($this->expired[$key]);
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    }
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    /**
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     * Get an expired endpoint. Returns null if none found.
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     *
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     * @return null|string
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     */
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    private function getExpired()
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    {
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        if (count($this->expired) < 1) {
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            return null;
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        }
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        $expired = key($this->expired);
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        $this->increment($this->expired);
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        return $expired;
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    }
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    private function increment(&$array)
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    {
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        if (next($array) === false) {
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            reset($array);
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        }
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    }
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}