比例图像调整大小 [英] Proportional image resizing

问题描述

我想将上传的图片调整为宽度：180px，比例高度。是否有任何课程要做？

i want to resize uploaded images to width: 180px with proportional height. Is there any classes to do this?

感谢您的帮助！

推荐答案

我认为这个问题可以使用实际代码示例的答案。下面的代码显示了如何在目录上传内调整图像大小，并将调整后的图像保存在文件夹 resized 。

I think this question can use an answer with an actual code example. The code below shows you how you to resize an image inside a directory uploaded, and save the resized image in the folder resized.

<?php
// the file
$filename = 'uploaded/my_image.jpg';

// the desired width of the image
$width = 180;

// content type
header('Content-Type: image/jpeg');

list($width_orig, $height_orig) = getimagesize($filename);

$ratio_orig = $width_orig/$height_orig;
$height = $width/$ratio_orig;

// resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

// output
imagejpeg($image_p, 'resized/my_image.jpg', 80);
?>

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