如何使用PHP在服务器端按比例缩小图像? [英] How to scale down an image on the server side with PHP?

问题描述

我有一些图像是从服务器提取的，而$imgUrl保存图像的路径.

I have some images that are pulled from a server and $imgUrl holds the path of the image.

现在，我使用<img src="<?php echo $imgUrl ?>" width="100" height="200"/>或CSS缩小图像，但是我想在PHP中进行处理，以便将已缩放的图像提供给DOM

Right now I use <img src="<?php echo $imgUrl ?>" width="100" height="200"/> or CSS to scale down the image, but I want to do it in PHP so that I will serve already scaled images to the DOM

有什么想法吗?

谢谢

推荐答案

此解决方案将导致在首次请求拇指时创建拇指.以后所有的请求都将获取已创建的缩略图.它正在使用 ImageMagick :

This solution will cause the thumb to be created when it is requested for the first time. All future requests will fetch the already created thumb. It is using ImageMagick:

HTML:

<img src="script.php?img=example" />

PHP(script.php):

PHP (script.php):

$width  = 140;
$height = 80;
$image  = $_GET['img'];
$ext    = 'png';

// Check if file exists
if ( ! file_exists('/path/to/the/'.$image.'.'.$ext))
{
    die('Unable to process the requested file.');
}

// Check if a thumb already exists, otherwise create a thumb
if (file_exists('/path/to/the/'.$image.'_thumb.'.$ext))
{
    $img = new imagick('/path/to/the/'.$image.'_thumb.'.$ext);
}
else
{
    $img = new imagick('/path/to/the/'.$image.'.'.$ext);
    $img->setImageFormat($ext);
    $img->scaleImage($width, 0);
    $img->cropImage($width, $height, 0, 0);
    $img->writeImage('/path/to/the/'.$image.'_thumb.'.$ext);
}

// Return as an image
header('Content-Type: image/'.$ext);
echo $img;

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