How can I the size of an image file from the URL?

Question

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"

How can we get the size of this file?

Pseudo-code:

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

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

Answer 1

Use filesize function like this:

echo filesize($filename) . ' bytes';

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]); }
}