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Cache class library implemented in PHP

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Cache class library implemented in PHP

<?php
class Cache {
  private $dir;
  private $lifetime;
  private $cacheid;
  private $ext;
  function __construct($dir='',$lifetime=1800) {
    if ($this->dir_isvalid($dir)) {
      $this->dir = $dir;
      $this->lifetime = $lifetime;
      $this->ext = '.Php';
      $this->cacheid = $this->getcacheid();
    }
  }
  private function isvalid() {
    if (!file_exists($this->cacheid)) return false;
    if (!(@$mtime = filemtime($this->cacheid))) return false;
    if (mktime() - $mtime > $this->lifetime) return false;
    return true;
  }

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