CodeIgniter 2 image_lib->resize() 错误 - 渲染空白页面并且不返回错误消息

Question

我正在尝试做一些非常简单的事情，但我看不到让它发挥作用。无论如何，我目前正在我的 MAMP 开发机器上进行测试，但从临时服务器 (GoDaddy GridHost) 获得相同的结果。

这就是我想要做的：

1. 上传用户从表单指定的图像。
2. 创建上传图像的缩略图。

我的示例中有一些额外的数据库代码，但脚本在 if( ! $this->image_lib->resize()) 调用时出现“错误”。但是，它会导致整个应用程序退出，呈现空白页面。该代码实际上从未进入 if{} 块。

function _upload_image(&$location, &$image = NULL)
{
    // Configure the initial full-sized image upload
    $upload_config = array(
        'upload_path' => "./uploads/users/{$this->viewer->id}/locations/{$location->id}/",
        'allowed_types' => 'jpg|jpeg|gif|bmp|png',
        'max_size' => 8192 // 8mb
    );

    $this->load->library('upload', $upload_config);

    // Upload failed
    if( ! $this->upload->do_upload('image'))
    {
        $this->errors = strip_tags($this->upload->display_errors());
        return FALSE;
    }

    // Get the uploaded file's metadata
    $data = $this->upload->data();

    // Change permissions of the uploaded file so that the image library can copy and resize it
    if(is_file($config['upload_path'] . $data['file_name']))
    {
        chmod($config['upload_path'] . $data['file_name'], 0777);
    }

    // If no existing image object was passed to this function, we are creating a brand new image
    if(is_null($image))
    {
        $image = new Image();
        $thumbnail = new Thumbnail();
    }
    else
    {
        $thumbnail = $image->thumbnail->get();  // Get the existing thumbnail
    }

    // Set the image object fields to save to the db
    $image->name = $data['file_name'];
    $image->mime_type = $data['file_type'];
    $image->extension = $data['file_ext'];
    $image->file_path = $data['file_path'];
    $image->full_path = $data['full_path'];
    $image->size = $data['file_size'];
    $image->width = $data['image_width'];
    $image->height = $data['image_height'];

    // Failed to save the image to the db
    if( ! $image->save())
    {
        $this->errors = array_merge($this->errors, array($image->error->string));
        return FALSE;
    }

    // Failed to save the location/image relationship in the db
    if( ! $location->save($image))
    {
        $this->errors = array_merge($this->errors, array($location->error->string));
        return FALSE;
    }

    // Configure options for the thumbnail
    $thumb_config = array(
        'image_library' => 'GD2',
        'source_image' => "./uploads/users/{$this->viewer->id}/locations/{$location->id}/{$image->name}",
        'create_thumb' => TRUE,
        'width' => 400,
        'height' => 300
    );

    $this->load->library('image_lib');
    $this->image_lib->initialize($thumb_config);

    // Failed to create the image thumbnail
    if( ! $this->image_lib->resize())
    {
        $this->errors = array_merge($this->errors, array($this->image_lib->display_errors()));
        return FALSE;
    }

    // Set the thumbnail object fields to save to the db
    $thumbnail->name = $data['raw_name'] . '_thumb' . $data['file_ext'];
    $thumbnail->file_path = $image->file_path;
    $thumbnail->full_path = $image->file_path . $thumbnail->name;

    // Failed to save the thumbnail to the db
    if( ! $thumbnail->save())
    {
        $this->errors = array_merge($this->errors, array($thumbnail->error->string));
        return FALSE;
    }

    // Failed to save the image/thumbnail relationship in the db
    if( ! $image->save($thumbnail))
    {
        $this->errors = array_merge($this->errors, array($image->error->string));
        return FALSE;
    }

    // Everything worked
    return TRUE;
}

数据库交互由 DataMapper ORM 处理，我将其包含在内是为了完整性，但我认为它不一定与此问题相关。该函数在调用时显然失败了：

if( ! $this->image_lib->resize())

Answer 1

您是否在index.php引导程序中设置了应用程序环境？如果您还没有将其设置为开发，则值得将其设置为开发，这可能会使错误可见，如果设置为测试/生产，这些错误将被隐藏。

define('ENVIRONMENT', 'development');

如果这不能帮助诊断问题，请在 MAMP 中转到“服务器”选项卡，单击“PHP”，然后单击“查看日志”。这将打开 PHP 错误日志文件，该文件有望让您了解发生了什么。