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wp-content/plugins/copy-delete-posts/analyst/src/Cache/DatabaseCache.php

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+<?php
+
+namespace Analyst\Cache;
+
+use Analyst\Contracts\CacheContract;
+
+/**
+ * Class DatabaseCache
+ *
+ * @since 1.1.5
+ */
+class DatabaseCache implements CacheContract
+{
+	const OPTION_KEY = 'analyst_cache';
+
+	protected static $instance;
+
+	/**
+	 * Get instance of db cache
+	 *
+	 * @return DatabaseCache
+	 */
+	public static function getInstance()
+	{
+		if (!self::$instance) {
+			self::$instance = new DatabaseCache();
+		}
+
+		return self::$instance;
+	}
+
+	/**
+	 * Key value pair
+	 *
+	 * @var array[]
+	 */
+	protected $values = [];
+
+	/**
+	 * DatabaseCache constructor.
+	 */
+	public function __construct()
+	{
+		$raw = get_option(self::OPTION_KEY, serialize([]));
+
+		// Raw data may be an array already
+		$this->values = is_array($raw) ? $raw : @unserialize($raw);
+
+		// In case serialization is failed
+		// make sure values is an array
+		if (!is_array($this->values)) {
+			$this->values = [];
+		}
+	}
+
+	/**
+	 * Save value with given key
+	 *
+	 * @param string $key
+	 * @param string $value
+	 *
+	 * @return static
+	 */
+	public function put($key, $value)
+	{
+		$this->values[$key] = $value;
+
+		$this->sync();
+
+		return $this;
+	}
+
+	/**
+	 * Get value by given key
+	 *
+	 * @param $key
+	 *
+	 * @param null $default
+	 * @return string
+	 */
+	public function get($key, $default = null)
+	{
+		$value = isset($this->values[$key]) ? $this->values[$key] : $default;
+
+		return $value;
+	}
+
+	/**
+	 * @param $key
+	 *
+	 * @return static
+	 */
+	public function delete($key)
+	{
+		if (isset($this->values[$key])) {
+			unset($this->values[$key]);
+
+			$this->sync();
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Update cache in DB
+	 */
+	protected function sync()
+	{
+		update_option(self::OPTION_KEY, serialize($this->values));
+	}
+
+	/**
+	 * Should get value and remove it from cache
+	 *
+	 * @param $key
+	 * @param null $default
+	 * @return mixed
+	 */
+	public function pop($key, $default = null)
+	{
+		$value = $this->get($key);
+
+		$this->delete($key);
+
+		return $value;
+	}
+}