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Edit File: LruArrayCache.php
<?php namespace Aws; /** * Simple in-memory LRU cache that limits the number of cached entries. * * The LRU cache is implemented using PHP's ordered associative array. When * accessing an element, the element is removed from the hash and re-added to * ensure that recently used items are always at the end of the list while * least recently used are at the beginning. When a value is added to the * cache, if the number of cached items exceeds the allowed number, the first * N number of items are removed from the array. */ class LruArrayCache implements CacheInterface, \Countable { /** @var int */ private $maxItems; /** @var array */ private $items = array(); /** * @param int $maxItems Maximum number of allowed cache items. */ public function __construct($maxItems = 1000) { $this->maxItems = $maxItems; } public function get($key) { if (!isset($this->items[$key])) { return null; } $entry = $this->items[$key]; // Ensure the item is not expired. if (!$entry[1] || time() < $entry[1]) { // LRU: remove the item and push it to the end of the array. unset($this->items[$key]); $this->items[$key] = $entry; return $entry[0]; } unset($this->items[$key]); return null; } public function set($key, $value, $ttl = 0) { // Only call time() if the TTL is not 0/false/null $ttl = $ttl ? time() + $ttl : 0; $this->items[$key] = [$value, $ttl]; // Determine if there are more items in the cache than allowed. $diff = count($this->items) - $this->maxItems; // Clear out least recently used items. if ($diff > 0) { // Reset to the beginning of the array and begin unsetting. reset($this->items); for ($i = 0; $i < $diff; $i++) { unset($this->items[key($this->items)]); next($this->items); } } } public function remove($key) { unset($this->items[$key]); } public function count() { return count($this->items); } }
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