如何在上传时调整多个图像文件的大小？

Question

I have the following php code for uploading:

$data = array();
$filesCount = count($_FILES['img']['name']);
for($i = 0; $i < $filesCount; $i++)
{
    $_FILES['userFile']['name'] = $_FILES['img']['name'][$i];
    $_FILES['userFile']['type'] = $_FILES['img']['type'][$i];
    $_FILES['userFile']['tmp_name'] = $_FILES['img']['tmp_name'][$i];
    $_FILES['userFile']['error'] = $_FILES['img']['error'][$i];
    $_FILES['userFile']['size'] = $_FILES['img']['size'][$i];


    $id = $this->session->userdata('ses_id');
    $tabel = $this->session->userdata('ses_tabel');
    if (!file_exists('uploads/'.$tabel.'/kategori'))
    {
        mkdir('uploads/'.$tabel.'/kategori', 0777, true);
    }else{  
        $uploadPath = 'uploads/'.$tabel.'/kategori';
        $newname = $idkategori.'_'.$nama;
        $config['upload_path'] = $uploadPath;
        $config['allowed_types'] = 'jpg|png|jpeg';
        $config['file_name'] = $newname;

        $this->load->library('upload', $config);
        $this->upload->initialize($config);
        if($this->upload->do_upload('userFile')){
            $fileData = $this->upload->data();
            $cfg['image_library'] = 'gd2';
            $cfg['quality'] = '50%';
            $this->load->library('image_lib');
            $this->image_lib->initialize($cfg);
            $this->image_lib->resize();
            $uploadData[$i]['nama'] = $this->input->post('nama_kategori');
            $uploadData[$i]['file_name'] = $fileData['file_name'];
            $uploadData[$i]['created'] = date("Y-m-d H:i:s");
            $uploadData[$i]['modified'] = date("Y-m-d H:i:s");
            $uploadData[$i]['id_resto'] = $id;
            $uploadData[$i]['id_kategori'] = $idkategori;
        }
    }
}

My file gets uploaded but is not resized, I want to resize image so that when I request it on an Android device, the image file is not too big. If possible please help me resize width and height too.

sorry for bad english, thank you.

Answer 1

You need to set the path of the newly uploaded image for the image lib config.

Read more here.

    $this->upload->initialize($config, true);  // important 2nd param
    if ($this->upload->do_upload('userFile')) {
        $fileData = $this->upload->data();
        $cfg['source_image'] = $fileData['full_path'];
        list($width, $height) = getimagesize($fileData['full_path']);
        $cfg['width'] = $width - 1;
        $cfg['height'] = $height - 1;
        $cfg['image_library'] = 'gd2';
        $cfg['quality'] = '50%';
        $this->load->library('image_lib');
        $this->image_lib->initialize($cfg);
        if (!$this->image_lib->resize()) {
            log_message('error', 'resize failed: ' . $this->image_lib->display_errors());
        }
        $this->image_lib->clear();
        $uploadData[$i]['nama'] = $this->input->post('nama_kategori');
        $uploadData[$i]['file_name'] = $fileData['file_name'];
        $uploadData[$i]['created'] = date("Y-m-d H:i:s");
        $uploadData[$i]['modified'] = date("Y-m-d H:i:s");
        $uploadData[$i]['id_resto'] = $id;
        $uploadData[$i]['id_kategori'] = $idkategori;
    }

UPDATE:

If you only want to change quality:

So I forgot I already answered this type of question before. If you dig into the image library code you will notice that the quality variable is only used when something actually needs to be resized! CI checks to see if the image size matches the designated output size and if it is a match or if the image width and height aren't specified in the config it just moves on... Thus the quality will never be affected. To hack around this you can get the width and height and subtract 1px. I wouldn't call it a bug but more of an oversight.

I personally don't like CI's upload or image lib and use https://github.com/verot/class.upload.php (this issue is not a problem there).

Here is the answer where I figured this all out: Image compress in Codeigniter3