function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')    {       $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");      if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))      {          $type = "TXT";      }      if (!preg_match('/^'.$types[$type].'/', $data))      {          $data = str_replace("\\", "", $types[$type]).$data;      }      $ch = curl_init();      $data = urlencode($data);      curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');      curl_setopt($ch, CURLOPT_POST, true);      curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);      curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);      curl_setopt($ch, CURLOPT_HEADER, false);      curl_setopt($ch, CURLOPT_TIMEOUT, 30);      $response = curl_exec($ch);      curl_close($ch);      return $response;  }

用法：

<?php  header("Content-type: image/png");  echo qr_code("http://koonk.com", "URL");  ?>