我有一个页面，用户可以在其中拖放多个图像。我需要调整大小并将其存储为缩略图，并且还必须在不丢失图像宽度和高度的情况下减少以 kb 为单位的大图像。在编码点火器中最好的方法是什么？
if ($_FILES["file"]["name"])
{
$targetPath = APPPATH . 'uploads/portfolios/';
$result = $this->do_upload("file", $targetPath);
$data = array();
if (!$result['status']) {
$data['error_msg'] ="Can not upload Image for " . $result['error'] . " ";
}
else {
$this->resize_image($targetPath . $result['upload_data']['file_name'],$targetPath,'120','120');
$file_name = $result['upload_data']['raw_name'].'_thumb'.$result['upload_data']['file_ext'];
}
function resize_image($sourcePath, $desPath, $width = '500', $height = '500')
{
$this->load->library('image_lib');
$this->image_lib->clear();
$config['image_library'] = 'gd2';
$config['source_image'] = $sourcePath;
$config['new_image'] = $desPath;
//$config['quality'] = '100%';
$config['create_thumb'] = TRUE;
$config['maintain_ratio'] = false;
$config['thumb_marker'] = '_thumb';
$config['width'] = 120;
$config['height'] = 120;
$this->image_lib->initialize($config);
if ($this->image_lib->resize())
return true;
return false;
}
function do_upload($htmlFieldName, $path)
{
$config['file_name'] = time();
$config['upload_path'] = $path;
$config['allowed_types'] = 'gif|jpg|jpeg|png';
$config['max_size'] = '20000';
//$config['max_width'] = '2000';
//$config['max_height'] = '2000';
$this->load->library('upload', $config);
$this->upload->initialize($config);
unset($config);
if (!$this->upload->do_upload($htmlFieldName))
{
return array('error' => $this->upload->display_errors(), 'status' => 0);
} else
{
return array('status' => 1, 'upload_data' => $this->upload->data());
}
}
我有类似的问题，可以通过本机php函数解决。
感谢他原来的答案中的 pez-cuckow。从它的问题也有改进，但它删除了对 gif 图像的支持。
function compressImage($source_url, $destination_url, $quality) {
$info = getimagesize($source_url);
if ($info['mime'] == 'image/jpeg')
$image= imagecreatefromjpeg($source_url);
elseif ($info['mime'] == 'image/gif')
$image = imagecreatefromgif($source_url);
elseif ($info['mime'] == 'image/png')
$image = imagecreatefrompng($source_url);
//save file
imagejpeg($image, $destination_url, $quality);
//return destination file
return $destination_url;
}