# Codeigniter 画像アップロードとリサイズ

    public function img_upload()
    {
        // アップロード設定
        $config = [
            'upload_path' => './img/',
            'allowed_types' => 'gif|jpg|png',
            'file_ext_tolower' => true,
            'max_size' => 0,
            'overwrite' => true,
        ];

        // アップロード初期化
        $this->load->library('upload', $config);

        // アップロード
        if (!$this->upload->do_upload('img_file')) {
            $error = array('error' => $this->upload->display_errors());
            return $this->json(['result' => false, $error]);
        } else {
            $data = $this->upload->data();

            // リサイズ設定
            $img_config = [
                'source_image' => $data['full_path'],
                'width' => 500
            ];

            // リサイズ初期化
            $this->load->library('image_lib', $img_config);

            $this->image_lib->resize();

            return $this->json(['result' => true, $data]);
        }
    }

$data = $this->upload->data();

$full_path = $this->upload->data('full_path');

Array
(
        [file_name]     => img_file.jpg
        [file_type]     => image/jpeg
        [file_path]     => /path/to/your/upload/
        [full_path]     => /path/to/your/upload/jpg.jpg
        [raw_name]      => img_file
        [orig_name]     => img_file.jpg
        [client_name]   => img_file.jpg
        [file_ext]      => .jpg
        [file_size]     => 22.2
        [is_image]      => 1
        [image_width]   => 800
        [image_height]  => 600
        [image_type]    => jpeg
        [image_size_str] => width="800" height="200"
)