PHP simulates the method of response class in asp

This article mainly introduces the method of simulating the response class in ASP in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

People who are used to asp or asp.net development will often use the response class. This class is used to process the client's response and can implement functions such as jump and output. There is no such class in PHP , but it is indeed possible to simulate this class through functions.

/* 
* 类用途: 实现类似于asp中的response功能 
*/
final class Response { 
  private $headers = array();  
  private $output; 
  private $level = 0; 
  public function addHeader($key, $value) { 
    $this->headers[$key] = $value; 
  } 
  public function removeHeader($key) { 
    if (isset($this->headers[$key])) { 
      unset($this->headers[$key]); 
    } 
  } 
  public function redirect($url) { 
    header('Location: ' . $url); 
    exit; 
  } 
  public function setOutput($output, $level = 0) { 
    $this->output = $output; 
    $this->level = $level; 
  } 
  private function compress($data, $level = 0) { 
    if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)) { 
      $encoding = 'gzip'; 
    }  
    if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== FALSE)) { 
      $encoding = 'x-gzip'; 
    } 
    if (!isset($encoding)) { 
      return $data; 
    } 
    if (!extension_loaded('zlib') || ini_get('zlib.output_compression')) { 
      return $data; 
    } 
    if (headers_sent()) { 
      return $data; 
    } 
    if (connection_status()) {  
      return $data; 
    } 
    $this->addHeader('Content-Encoding', $encoding); 
    return gzencode($data, (int)$level); 
  } 
  public function output() { 
    if ($this->level) { 
      $ouput = $this->compress($this->output, $this->level); 
    } else { 
      $ouput = $this->output; 
    }   
    if (!headers_sent()) { 
      foreach ($this->headers as $key => $value) { 
        header($key . ': ' . $value); 
      } 
    } 
    echo $ouput; 
  } 
}

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