在codeigniter上传图像，是否需要用户文件？

Question

I am using the function below to upload my image files to my server(Localhost). It is fine and image is being uploaded. But I need two image fields and hence both the images should be uploaded once the submit button is clicked. I used the function described here Codeigniter multiple file upload , but it is not working.

I get this error message

A PHP Error was encountered

Severity: Warning

Message: is_uploaded_file() expects parameter 1 to be string, array given

Filename: libraries/Upload.php

Line Number: 161

Well I cannot understand where the error is. The function that I am using to upload single image is

function do_upload()
    {
        $config['upload_path'] = './uploads/';
        $config['allowed_types'] = 'jpeg|png|gif';
        $config['max_size'] = '0';
        $config['max_width']  = '0';
        $config['max_height']  = '0';

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

        if ( ! $this->upload->do_upload())
        {
            $error = array('error' => $this->upload->display_errors());
           //failed display the errors
        }
        else
        {
            //success

        }
    }

In addition I also like to ask can i change the input field name of my choice. i.e i always need to implement <input type="file" name="userfile"/> . Is it possible to change the name? I tried changing it and I get the message No file was selected, so that must mean that I cannot change it.

Answer 1

You have to loop through the uploaded files like it is shown in your provided link.

function do_upload() {
        $config['upload_path'] = './uploads/';
        $config['allowed_types'] = 'jpeg|png|gif';
        $config['max_size'] = '0';
        $config['max_width']  = '0';
        $config['max_height']  = '0';

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

        foreach ($_FILES as $key => $value) {

            if (!empty($value['tmp_name'])) {

                if ( ! $this->upload->do_upload($key)) {
                    $error = array('error' => $this->upload->display_errors());
                    //failed display the errors
                } else {
                    //success
                }

            }
        }
}

And try using HTML like this:

<input type="file" name="file1" id="file_1" />
<input type="file" name="file2" id="file_2" />
<input type="file" name="file3" id="file_3" />

You can change the names of the input fields as you like.