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✏️ Editing: ZendPlatform.php

<?php
namespace W3TCL\Minify;
/**
 * Class Minify_Cache_ZendPlatform
 * @package Minify
 */

/**
 * ZendPlatform-based cache class for Minify
 *
 * Based on Minify_Cache_APC, uses output_cache_get/put (currently deprecated)
 *
 * <code>
 * Minify::setCache(new Minify_Cache_ZendPlatform());
 * </code>
 *
 * @package Minify
 * @author Patrick van Dissel
 */
class Minify_Cache_ZendPlatform {

/**
	 * Create a Minify_Cache_ZendPlatform object, to be passed to
	 * Minify::setCache().
	 *
	 * @param int $expire seconds until expiration (default = 0
	 * meaning the item will not get an expiration date)
	 *
	 * @return null
	 */
	public function __construct($expire = 0)
	{
		$this->_exp = $expire;
	}

/**
	 * Write data to cache.
	 *
	 * @param string $id cache id
	 *
	 * @param string $data
	 *
	 * @return bool success
	 */
	public function store( $id, $data ) {
		return output_cache_put(
			$id,
			( isset( $_SERVER['REQUEST_TIME'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_TIME'] ) ) : '' ) . '|' . $data
		);
	}

/**
	 * Get the size of a cache entry
	 *
	 * @param string $id cache id
	 *
	 * @return int size in bytes
	 */
	public function getSize($id)
	{
		return $this->_fetch($id)
			? strlen($this->_data)
			: false;
	}

/**
	 * Does a valid cache entry exist?
	 *
	 * @param string $id cache id
	 *
	 * @param int $srcMtime mtime of the original source file(s)
	 *
	 * @return bool exists
	 */
	public function isValid($id, $srcMtime)
	{
		$ret = ($this->_fetch($id) && ($this->_lm >= $srcMtime));
		return $ret;
	}

/**
	 * Send the cached content to output.
	 *
	 * @param string $id Cache id.
	 */
	public function display( $id ) {
		echo $this->_fetch( $id ) ? $this->_data : '';
	}

/**
	 * Fetch the cached content
	 *
	 * @param string $id cache id
	 *
	 * @return string
	 */
	public function fetch($id)
	{
		return $this->_fetch($id)
			? $this->_data
			: '';
	}

private $_exp = null;

// cache of most recently fetched id
	private $_lm = null;
	private $_data = null;
	private $_id = null;

/**
	 * Fetch data and timestamp from ZendPlatform, store in instance
	 *
	 * @param string $id
	 *
	 * @return bool success
	 */
	private function _fetch($id)
	{
		if ($this->_id === $id) {
			return true;
		}
		$ret = output_cache_get($id, $this->_exp);
		if (false === $ret) {
			$this->_id = null;
			return false;
		}
		list($this->_lm, $this->_data) = explode('|', $ret, 2);
		$this->_id = $id;
		return true;
	}
}

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