如何通过URL调整图像文件的大小? [英] How can I the size of an image file from the URL?

问题描述

图片和脚本托管在同一帐户(一个站点)上，但我们只知道图片的URL.

Images and script are hosted on the same account (one site), but we know only the URL of the image.

$image = "http://example.com/images/full-1091.jpg"

我们如何获得此文件的大小?

How can we get the size of this file?

伪代码:

{ do something with $image and get $image_size }
echo $image_size;

我希望将$image_size设置为易于阅读的文件格式，例如"156,8 KB"或"20,1 MB".

I would prefer $image_size to be formatted in human-readable file sizes, like "156,8 Kbytes" or "20,1 Mbytes".

推荐答案

使用 filesize 这样的功能:

Use filesize function like this:

echo filesize($filename) . ' bytes';

您还可以使用此功能设置尺寸单位的格式:

You can also format the unit of the size with this function:

function format_size($size) {
      $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB");
      if ($size == 0) { return('n/a'); } else {
      return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]); }
}

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