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function upload_file(){
        $upload_dir_name = 'widgets';
        $field_name = 'field_pic';
        $thumb_width = 200;
        $thumb_height = '';
        $extensions = array('jpg','jpeg', 'png', 'bmp');
        $data_upload = array(
            'file_field_name' => $field_name,
            'files' => $_FILES,
            'upload_dir' => realpath(APPPATH . '../public/uploads/'.$upload_dir_name),
            'thumb_width' => $thumb_width,
            'thumb_height' => $thumb_height,
            'max_size' => '5120', // 5MB
            'extensions' => $extensions
            
        );
        echo '<pre>';
        $data = upload_file_helper($data_upload);
        print_r($data);
        exit;
    }

-------------

if (!function_exists('upload_file_helper')) {
    function upload_file_helper($data_upload){
        $CI = & get_instance();
        if($data_upload['files']){
                                
            $_FILES[$data_upload['file_field_name']]['name']= $data_upload['files'][$data_upload['file_field_name']]['name'];
            $_FILES[$data_upload['file_field_name']]['type']= $data_upload['files'][$data_upload['file_field_name']]['type'];
            $_FILES[$data_upload['file_field_name']]['tmp_name']= $data_upload['files'][$data_upload['file_field_name']]['tmp_name'];
            $_FILES[$data_upload['file_field_name']]['error']= $data_upload['files'][$data_upload['file_field_name']]['error'];
            $_FILES[$data_upload['file_field_name']]['size']= $data_upload['files'][$data_upload['file_field_name']]['size'];    
            
            $upload_dir = $data_upload['upload_dir'];
            if (!is_dir($upload_dir)) {
                 mkdir($upload_dir);
            }	
            chmod($upload_dir,0777);
            $config['upload_path']   = $upload_dir;
            $config['allowed_types'] = (is_array($data_upload['extensions']))?implode('|',$data_upload['extensions']):'gif|jpg|png|jpeg';
            $config['file_name']     = 'userimage_'.substr(md5(rand()),0,7);
            $config['overwrite']     = false;
            $config['max_size']	 =  $data_upload['max_size'];

            $CI->load->library(array('upload','image_lib'));
            $CI->upload->initialize($config);
            if (!$CI->upload->do_upload($data_upload['file_field_name'])){
                $upload_data['error'] = 'Yes';
                $upload_data['msg'] = $CI->upload->display_errors();
                return $upload_data;
            }	
            else{
                $upload_data=$CI->upload->data();
                
                chmod($upload_dir.'/thumb/',0777);
                $thumb_config['image_library'] = 'gd2';
                $thumb_config['source_image']	= $upload_dir.'/'.$upload_data['file_name'];
                $thumb_config['new_image']	= $upload_dir.'/thumb/'.$upload_data['file_name'];
                $thumb_config['width']	 = $data_upload['thumb_width'];
                if($data_upload['thumb_height']!=''){
                    $thumb_config['height']	 = $data_upload['thumb_height'];
                    $thumb_config['maintain_ratio'] = FALSE;
                }else{
                    $thumb_config['maintain_ratio'] = TRUE;
                    
                }
                $CI->image_lib->clear();
                $CI->image_lib->initialize($thumb_config);
                $CI->image_lib->resize();
                $upload_data['error'] = 'No';
                return $upload_data;
            }	
        }
    }
}