PHP模拟asp中response类实现方法

时间:2021-07-13 01:27:44

本文实例讲述了PHP模拟aspresponse类的方法。分享给大家供大家参考。具体如下:

习惯了asp或是asp.net开发的人, 他们会经常用到response类,这个类用于处理客户端的响应,可以实现跳转,输出等功能. 在php中没有这个类,但是确实可以通过函数来模拟这个类.

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/*
* 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;
  }
}

希望本文所述对大家的php程序设计有所帮助。