复制后图像损坏

Question

尝试从远程服务器复制图像，以便在我的wordpress网站中用作缩略图。复制后，部分图像会损坏。

这是我的代码：

$url = 'http://media.cultserv.ru/i/1000x1000/'.$event->subevents[0]->image;
$timeout_seconds = 100;
$temp_file = download_url( $url, $timeout_seconds );

if(!is_wp_error( $temp_file )) {
  $file = array(
    'name' => basename($url),
    'type' => wp_check_filetype(basename($url), null),
    'tmp_name' => $temp_file,
    'error' => 0,
    'size' => filesize($temp_file),
  );
  $overrides = array(
    'test_form' => false,
    'test_size' => true,
    'test_upload' => true,
  );
  $results = wp_handle_sideload( $file, $overrides );
  if(empty($results['error'])) {
    $filename = $results['file'];
    $local_url = $results['url'];
    $type = $results['type'];
    $attachment = array(
      'post_mime_type' => $results['type'],
      'post_title' => preg_replace('/.[^.]+$/', '', basename( $results['file'] ) ),
      'post_content' => '',
      'post_status' => 'inherit',
      'post_type' => 'attachment',
      'post_parent' => $pID,
    );
    $attachment_id = wp_insert_attachment( $attachment, $filename );
    if($attachment_id) {
      set_post_thumbnail( $pID, $attachment_id );
    }
  }
}

这是一个截图，显示我的意思（左 - 原始图像;右 - 我的服务器上的副本）：

Answer 1

我认为您的download_url( $url, $timeout_seconds )功能无法正常工作（您无法捕获网络/其他错误，这就是您损坏图像的原因），我也不认为超时参数确实存在需要下载网址...

要解决此问题，最好将此函数重写为以下内容：

function download_url($url)
{
    $saveto = 'temp.jpg'; // generate temp file
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    $raw = curl_exec($ch);
    if (curl_errno($ch)) {
        curl_close($ch);
        return false;
        // you probably have a network problem here.
        // you need to handle it, for example retry or skip and reqeue the image url
    }
    curl_close($ch);
    if (file_exists($saveto)) {
        unlink($saveto);
    }
    $fp = fopen($saveto, 'x');
    fwrite($fp, $raw);
    fclose($fp);
    return $saveto;
}