gistfile1.php

<?php

class OneEntryCacheEngine extends CacheEngine {
	protected $_dirty = false;
	protected $_data  = false;

	public function read($key) {
		if ($this->_data === false) {
			$this->_data = (array)Cache::read($this->_config['cacheKey'], $this->_config['cacheConfig']);
		}
		if (!array_key_exists($key, $this->_data)) {
			return false;
		}
		return $this->_data[$key];
	}

	public function write($key, $value) {
		if ($this->_data === false) {
			$this->_data = [];
		}
		$this->_dirty = true;
		$this->_data[$key] = $value;
	}

	public function shutdown() {
		if ($this->_dirty === false) {
			return;
		}
		Cache::write($this->_config['cacheKey'], $this->_data, $this->_config['cacheConfig']);
	}
}