为什么 redirect() 不允许我完成函数调用？

Question

所以我正在编写一个函数，允许我将一个数据库表中的 ID 添加到另一个数据库表中以将两者关联起来，但我遇到了一些麻烦，似乎无法弄清楚该怎么做。任何帮助都会非常感激。

请原谅我的一些乱七八糟的代码，我一直在尝试许多似乎不起作用的不同解决方案。

class photo_modle extends CI_Model {

var $gallery_path;
var $image_name;
var $row;
var $gid; // gallary ID
var $iid; // image ID
function photo_modle() {
ob_start();
    $this->gallery_path = realpath(APPPATH . '../images');
}

function uploadPhoto() {


    $config = array(
        'allowed_types' => 'jpg|jpeg',
        'upload_path' => $this->gallery_path,
    );

    $this->load->library('upload', $config);
    $this->upload->do_upload();
    $image_data = $this->upload->data();

    $this->image_name = $image_data['file_name'];
    $config = array(
        'source_image' => $image_data['full_path'],
        'new_image' => realpath($this->gallery_path . '/thumb/normal/'),
        'width' => 248,
        'height' => 198,
        'maintain_ratio' => false
    );

    $this->load->library('image_lib', $config);
    $this->image_lib->resize();

    $data = array(
        'image_name' => $this->image_name,
        'description' => $this->input->post('description'),
        'name' => $this->input->post('name')

    );



    $str = $this->db->insert_string('images', $data);

    $this->db->query($str);
    $this->iid = $this->db->insert_id();


    $grayscale_path = '/Applications/XAMPP/xamppfiles/htdocs/images/thumb/normal/' . $this->image_name;
    header('Content-type: image/jpeg');
    $img = imagecreatefromjpeg($grayscale_path);
    imagefilter($img, IMG_FILTER_GRAYSCALE);
    imagejpeg($img, '/Applications/XAMPP/xamppfiles/htdocs/images/thumb/rollover/' . $this->image_name, 100);
    imagedestroy($img);
    $ndata = array (
        'image_name' => $this->image_name,
        'description' => $this->input->post('description'),
        'name' => $this->input->post('name'),
        'id' => $this->iid
         );

    $this->session->set_userdata($ndata);


}




function add_new_gallery() {


    $ndata = array(
        'gallery_name' => $this->input->post('gallery_name'),
        'description' => $this->input->post('gallery_description'),
     ); 

     $n_str = $this->db->insert('gallery', $ndata);
    // this is the only place where i can put the redirect without it returning errors
    // but if i do it here it does not pass back the gid variable which i need. 
    // I also should mention that I have a  header('Content-type: image/jpeg'); above all of
    // this, and that is why I have to do a redirect, so that I don't get an error. and that 
    // header code is nessasary, for I am doing some photo manipulation that requires it. 
     redirect('site/uploaded'); 
     $this->db->query($n_str);
     $this->gid = $this->db->insert_id();

     // I was trying to send that info in the session, but even that did not work because of the 
     // redirect
     $sdata = array(
         'gallery_id' => $this->gid
     );

     $this->session->set_userdata($sdata);


}
// this function needs the info that is not getting passed. 
function addId() {
      $sdata = array('gallery_id' => $this->session->userdata('gallery_id'));
     $where = "id = ".$this->session->userdata('image_id'); 
     $str = $this->db->update_string('images', $sdata, $where);

     $this->db->query($str);
}

感谢任何可以提供帮助的人，非常感谢您抽出宝贵的时间。任何建议都会很棒！

Answer 1

如果您只是处理图像并将结果保存到文件中，则无需发送Content-type: image/jpeg 标头。

仅在您向浏览器发送图像时才需要。

您可能对imagejpeg 的工作原理感到困惑，因为它具有双重行为。 imagejpg 可以：

• 如果您不传递$filename，则直接将图像输出到浏览器。当然，您需要警告浏览器期待图像数据，即在您向其发送内容类型标头时。

• 将图像保存到文件中，如果你给它一个$filename。

在您的情况下，您确实将其传递给$filename，以便将图像保存到磁盘。但是您还发送了一个Content-type: image/jpeg，因此您的浏览器期望接收图像数据，这永远不会发生，然后它“无法显示，因为它包含错误”。