original_string: public function retrieve($key)
      {
        // Get value by key
        $value = $this->redis->get($key);
  
        if($value === false)
          return null;
  
        return $value;
      }
code: public function retrieve($key)
      {
        // Get value by key
        $value = $this->redis->get($key);
  
        if($value === false)
          return null;
  
        return $value;
      }
code_tokens: public function retrieve ( $ key ) { // Get value by key $ value = $ this -> redis -> get ( $ key ) ; if ( $ value === false ) return null ; return $ value ; }
docstring: Retrieve value from redis server
  
  @param string $key
  @return string
docstring_tokens: Retrieve value from redis server