在我的旧PHP应用程序中,我曾经运行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($virtual_image); //Free up memory
}
问题是,现在我想在laravel 5.6应用程序中运行类似的功能,所以我创建了一个具有完全相同功能的控制器,但不是得到输出图像缩略图我得到问号和奇怪的钻石图标,一些东西像编码版的php gd库jpeg图像。
我试着使用return response() - > file($ pathToFile);正如laravel文档描述但我不会在缩略图图像的位置存储。
有任何想法吗?
先感谢您!
我建议你这个包安装和使用非常简单,非常友好的编程。它叫干预
Intervention package to handle images
您可以使缩略图非常简单,如下所示:
$img = Image::make('public/foo.jpg')->resize(320, 240)->insert('public/watermark.png');
按中心调整大小并裁剪图像
无需安装和包含任何包。只需在laravel / lumen中创建一个帮助程序,并将代码放在该帮助程序文件中,并在任何需要的地方使用它:
function resize_crop_image($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");
代码已经多次测试并且运行良好。一切顺利,节省您的时间,享受生活:)