Codeigniter Image watermark using image library - codeigniter

Question

I want apply watermark on multiple images after uploading. Right now the images are uploading but all are without watermark and also I want to reduce the quality of uploading image.
public function do_upload()
{
$this->load->library('upload');
$name_array = array();
$files = $_FILES;
$cpt = count($_FILES['userfile1']['name']);
for($i=0; $i<=$cpt-1; $i++)
{
$_FILES['userfile']['name']= $files['userfile1']['name'][$i];
$_FILES['userfile']['type']= $files['userfile1']['type'][$i];
$_FILES['userfile']['tmp_name']= $files['userfile1']['tmp_name'][$i];
$_FILES['userfile']['error']= $files['userfile1']['error'][$i];
$_FILES['userfile']['size']= $files['userfile1']['size'][$i];
$this->upload->initialize($this->set_upload_options());
if($data = $this->upload->do_upload()){
$config['source_image'] = $files['userfile1']['tmp_name'][$i]; //get original image
$config['wm_type'] = 'overlay';
$config['wm_overlay_path'] = './portfolio_img/ninja.png';
$config['quality'] = 50;
$config['wm_vrt_alignment'] = 'bottom';
$config['wm_hor_alignment'] = 'right';
$this->load->library('image_lib', $config);
$this->image_lib->watermark();
}
$name_array[] = $this->upload->data('file_name');
}
return $name_array;
}
private function set_upload_options()
{
//upload an image options
$config = array();
$config['upload_path'] = './portfolio_img/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = '0';
$config['overwrite'] = FALSE;
return $config;
}

Answer 1

Watermark method need image path you are passing tem_path hope this will work
try this
$config['source_image'] = './portfolio_img/' . $files['userfile1']['name'][$i]
it is working for me
UDATE
please load library before the loop and change source_image name each time.
$config['source_image'] = '';
$config['wm_type'] = 'overlay';
$config['wm_overlay_path'] = './portfolio_img/ninja.png';
$config['quality'] = 50;
$config['wm_vrt_alignment'] = 'bottom';
$config['wm_hor_alignment'] = 'right';
$this->load->library('image_lib', $config);
for($i=0; $i<=$cpt-1; $i++)
{
$_FILES['userfile']['name']= $files['userfile1']['name'][$i];
$_FILES['userfile']['type']= $files['userfile1']['type'][$i];
$_FILES['userfile']['tmp_name']= $files['userfile1']['tmp_name'][$i];
$_FILES['userfile']['error']= $files['userfile1']['error'][$i];
$_FILES['userfile']['size']= $files['userfile1']['size'][$i];
$this->upload->initialize($this->set_upload_options());
if($data = $this->upload->do_upload()){
$config['source_image'] = './portfolio_img/' . $files['userfile1']['name'][$i]
$this->image_lib->initialize($config);
$this->image_lib->watermark();
}
$name_array[] = $this->upload->data('file_name');
}