Upload Resize Image CI - php

Question

I'm setting up the upload file before add resize code. And its normally process, but after adding resize code my controller isn't working. Can you help me with this? I'm trying but it didn't work.
And my another problem, I can't upload image file size more than 2MB.
This for my work on online shop.
public function submit_image()
{
$input_name = $_POST['input_name'];
$input_email = $_POST['input_email'];
$input_code_transaction = $_POST['input_code_transaction'];
$config['file_name'] = $input_code_transaction;
$config['overwrite'] = TRUE;
$config['upload_path'] = './img/';
$config['allowed_types'] = 'gif|jpg|png|jpeg';
$config['max_size'] = 50000000;
$config['max_width'] = 6000;
$config['max_height'] = 4000;
$this->upload->initialize($config);
if(!empty($_FILES['filefoto']['name'])) {
if ($this->upload->do_upload('doc')) {
$gbr = $this->upload->data();
//Compress Image
$config['image_library']='gd2';
$config['source_image']='./img/'.$gbr['file_name'];
$config['create_thumb']= FALSE;
$config['maintain_ratio']= FALSE;
$config['quality']= '50%';
$config['width']= 1280;
$config['height']= 720;
$config['new_image']= './img/'.$gbr['file_name'];
$this->load->library('upload', $config);
$this->upload->resize();
$data = $upload_data = $this->upload->data();
$input_picture = $this->upload->do_upload('doc');
}
}
}

Answer 1

The upload library has no inbuilt features for image resizing.
This whole section:
$config['image_library']='gd2';
$config['source_image']='./img/'.$gbr['file_name'];
$config['create_thumb']= FALSE;
$config['maintain_ratio']= FALSE;
$config['quality']= '50%';
$config['width']= 1280;
$config['height']= 720;
$config['new_image']= './img/'.$gbr['file_name'];
$this->load->library('upload', $config);
$this->upload->resize();
$data = $upload_data = $this->upload->data();
$input_gambar = $this->upload->do_upload('doc');
needs to reference image_lib the image resizer codeigniter uses: https://www.codeigniter.com/user_guide/libraries/image_lib.html
So:
if ($this->upload->do_upload('doc')) {
$gbr = $this->upload->data();
//Compress Image
$imlib['image_library'] = 'gd2';
$imlib['source_image'] = './img/' . $gbr['file_name'];
$imlib['create_thumb'] = FALSE;
$imlib['maintain_ratio'] = FALSE;
$imlib['quality'] = '50%';
$imlib['width'] = 1280;
$imlib['height'] = 720;
$imlib['new_image'] = './img/resized_' . $gbr['file_name'];
$this->load->library('image_lib', $imlib);
if (!$this->image_lib->resize()) {
show_error($this->image_lib->display_errors());
}
$yourouputimage = './img/resized_' . $gbr['file_name'];
}