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PHP class library for file caching

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PHP class library for file caching

<?php
class CacheLayer{
  protected $root = "";
  protected $cache = "";
  protected $key = "";
  protected $life = 0;
  public function __construct($key, $root = "/cachelayer"){
    $this->root = $_SERVER["DOCUMENT_ROOT"].$root;
    $this->key = $key;
  }
  public function expired($life_span){
    $this->life = $life_span;
    $file = $this->root."/".$this->key.".cachelayer";
    if(is_file($file)){
      $mtime = filemtime($file);
      return (time() >= ($mtime + $this->life));
    }else{
      return true;
    }
  }
  public function put($content){
    $file = $this->root."/".$this->key.".cachelayer";
    if(!is_dir(dirname($this->root))){
      return false;
    }
    $this->delete();
    $content = json_encode($content);
    return (bool)file_put_contents($file, $content);
  }
  public function get(){
    $file = $this->root."/".$this->key.".cachelayer";
    if(is_file($file)){
      return json_decode(file_get_contents($file), true);
    }
    return array();
  }
  public function delete(){
    $file = $this->root."/".$this->key.".cachelayer";
    if(is_file($file)){
      unlink($file);
      return true;
    }
    return false;
  }
}
?>

This is a very useful PHP caching library. Friends who need it can download and use it. It can greatly relieve the pressure on the database through file caching

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