Laravel 5.6：创建图像缩略图
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Laravel 5.6: Create image thumbnails
提问by Vasileios Tsakalis
In my old PHP apps i used to run a function like the one bellow to create jpeg image thumbnails.
在我的旧 PHP 应用程序中，我曾经运行一个类似下面的函数来创建 jpeg 图像缩略图。
function imageThumbanail() {
$image_src = imagecreatefromjpeg('http://examplesite.com/images/sample-image.jpg');
$thumbnail_width = 180; //Desirable thumbnail width size 180px
$image_width = imagesx($image_src); //Original image width size -> 1080px
$image_height = imagesy($image_src); //Original image height size -> 1080px
$thumbnail_height = floor( $image_height * ( $thumb_width / $image_width ) ); //Calculate the right thumbnail height depends on given thumbnail width
$virtual_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresampled($virtual_image, $image_src, 0, 0, 0, 0, $thumbnail_width, $thumbnail_height, $image_width, $image_height);
header('Content-Type: image/jpeg');
imagejpeg($virtual_image, null, 100);
imagedestroy($virtual_image); //Free up memory
}
The problem is that now i'd like to run a similar function in a laravel 5.6 app, so i created a controller with the exact same function but instead of get as an output the image thumbnail i get question marks and strange diamond icons, something like encoded version of php gd library jpeg image.
问题是，现在我想在 laravel 5.6 应用程序中运行类似的功能，所以我创建了一个具有完全相同功能的控制器，但没有将图像缩略图作为输出，我得到了问号和奇怪的菱形图标，一些东西像 php gd 库 jpeg 图像的编码版本。
I tried to use return response()->file($pathToFile); as laravel documentation describes but i won't store in a location the thumbnail image.
我尝试使用 return response()->file($pathToFile); 正如laravel 文档所描述的那样，但我不会将缩略图图像存储在某个位置。
Any ideas?
有任何想法吗？
Thank you in advance!
先感谢您！
回答by Marco Feregrino
I recommend you this package is very simple to install and use it and very kind with programming. Its called Intervention
我向您推荐这个包的安装和使用非常简单，并且非常适合编程。它叫做干预
Intervention package to handle images
You can make a thumbnail very simple like the following :
您可以制作一个非常简单的缩略图，如下所示：
$img = Image::make('public/foo.jpg')->resize(320, 240)->insert('public/watermark.png');
回答by Kamlesh
Resize and crop image by center
按中心调整大小和裁剪图像
No need to install and include any package. Just create a helper in laravel / lumen and put below code in that helper file and use it wherever you want:
无需安装和包含任何包。只需在 laravel / lumen 中创建一个帮助程序并将以下代码放入该帮助程序文件中，然后在您想要的任何地方使用它：
function resize_crop_image($max_width, $max_height, $source_file, $dst_dir, $quality = 80){
$imgsize = getimagesize($source_file);
$width = $imgsize[0];
$height = $imgsize[1];
$mime = $imgsize['mime'];
switch($mime){
case 'image/gif':
$image_create = "imagecreatefromgif";
$image = "imagegif";
break;
case 'image/png':
$image_create = "imagecreatefrompng";
$image = "imagepng";
$quality = 7;
break;
case 'image/jpeg':
$image_create = "imagecreatefromjpeg";
$image = "imagejpeg";
$quality = 80;
break;
default:
return false;
break;
}
$dst_img = imagecreatetruecolor($max_width, $max_height);
$src_img = $image_create($source_file);
$width_new = $height * $max_width / $max_height;
$height_new = $width * $max_height / $max_width;
//if the new width is greater than the actual width of the image, then the height is too large and the rest cut off, or vice versa
if($width_new > $width){
//cut point by height
$h_point = (($height - $height_new) / 2);
//copy image
imagecopyresampled($dst_img, $src_img, 0, 0, 0, $h_point, $max_width, $max_height, $width, $height_new);
}else{
//cut point by width
$w_point = (($width - $width_new) / 2);
imagecopyresampled($dst_img, $src_img, 0, 0, $w_point, 0, $max_width, $max_height, $width_new, $height);
}
$image($dst_img, $dst_dir, $quality);
if($dst_img)imagedestroy($dst_img);
if($src_img)imagedestroy($src_img);
}
//usage example
resize_crop_image(100, 100, "test.jpg", "test.jpg");
Code is already tested many times and working well. All the best, save your time and enjoy your life :)
代码已经过多次测试并且运行良好。祝您一切顺利，节省您的时间，享受您的生活:)
