/* 使用curl函数 */
$url = "https://api.weixin.qq.com/cgi-bin/material/add_material";
$post_data = array(
  'media' => '@bag03.jpg',
);
$response = curl_http($url, 'POST', $post_data);
$params = array();
$params = json_decode($response,true);
if (isset($params['errcode']))
{
  echo "error:" . $params['errcode'];
  echo "msg :" . $params['errmsg'];
  exit;
}
var_dump( $params );
/**
 * http请求方式: 默认GET
 */
function curl_http($url, $method="GET", $postfields){
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
  curl_setopt($ch, CURLOPT_URL, $url);
  switch ($method) {
    case "POST":
      curl_setopt($ch, CURLOPT_POST, true);
      if (!empty($postfields)) {
        $hadFile = false;
        if (is_array($postfields) && isset($postfields['media'])) {
          /* 支持文件上传 */
          if (class_exists('\CURLFile')) {
            curl_setopt($ch, CURLOPT_SAFE_UPLOAD, true);
            foreach ($postfields as $key => $value) {
              if (isPostHasFile($value)) {
                $postfields[$key] = new \CURLFile(realpath(ltrim($value, '@')));
                $hadFile = true;
              }
            }
          } elseif (defined('CURLOPT_SAFE_UPLOAD')) {
            if (isPostHasFile($value)) {
              curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);
              $hadFile = true;
            }
          }
        }
        $tmpdatastr = (!$hadFile && is_array($postfields)) "错误请求");
  }
  return $response;
}
function isPostHasFile($value)
{
  if (is_string($value) && strpos($value, '@') === 0 && is_file(realpath(ltrim($value, '@')))) {
    return true;
  }
  return false;
}

/* 使用exec函数 */
$command = 'curl -F media=@'.$filepath.' "https://api.weixin.qq.com/cgi-bin/media/upload"';
$retval = array();
exec($command, $retval, $status);
$params = array();
$params = json_decode($retval[0],true);
if ($status != 0) {
  $params = array(
    'errcode'  => '-100',
    'errmsg'  => '公众号服务出错，请联系管理员',
  );
}
return $params;

/* 使用system函数 */
$command = 'curl -F media=@'.$filepath.' "https://api.weixin.qq.com/cgi-bin/media/upload"';
$retval = 1;
$last_line = system($command, $retval);
$params = array();
$params = json_decode($last_line,true);
if ($retval != 0) {
  if (isset($params['errcode'])) {
    $params = array(
      'errcode'  => '-100',
      'errmsg'  => '公众号服务出错，请联系管理员',
    );
  }
}
return $params;