php how to get web image size in kb?

Question

php how to get web image size in kb?

getimagesize only get the width and height.

and filesize caused waring.

$imgsize=filesize("http://static.adzerk.net/Advertisers/2564.jpg");
echo $imgsize;

Warning: filesize() [function.filesize]: stat failed for http://static.adzerk.net/Advertisers/2564.jpg

Is there any other way to get a web image size in kb?

Solution 1

Short of doing a complete HTTP request, there is no easy way:

$img = get_headers("http://static.adzerk.net/Advertisers/2564.jpg", 1);
print $img["Content-Length"];

You can likely utilize cURL however to send a lighter HEAD request instead.

Solution 2

<?php
$file_size = filesize($_SERVER['DOCUMENT_ROOT']."/Advertisers/2564.jpg"); // Get file size in bytes
$file_size = $file_size / 1024; // Get file size in KB
echo $file_size; // Echo file size
?>

Solution 3

Not sure about using filesize() for remote files, but there are good snippets on php.net though about using cURL.

http://www.php.net/manual/en/function.filesize.php#92462

Solution 4

That sounds like a permissions issue because filesize() should work just fine.

Here is an example:

php > echo filesize("./9832712.jpg");
1433719

Make sure the permissions are set correctly on the image and that the path is also correct. You will need to apply some math to convert from bytes to KB but after doing that you should be in good shape!

Solution 5

Here is a good link regarding filesize()

You cannot use filesize() to retrieve remote file information. It must first be downloaded or determined by another method

Using Curl here is a good method:

Tutorial

View more solutions

Comments

[fish man]

great, get_headers run faster. Thanks.

[Darien]

Make sure your HTTP client is not sending any headers saying it accepts gzipped HTTP responses, or else the Content-Length will be wrong because the server will send compressed data back.

[mario]

@Darien: Excellent catch! Luckily get_headers sends a pretty plain HTTP/1.0 request. But for cURL this would need more diligence.

[Gordon]

get_headers can also do a HEAD request. there is an example in the php manual showing how.

[maxisme]

This sometimes returns an array: Array ( [0] => 0 [1] => 103823 ) How do I handle that? get_headers($imageURL, 1)["Content-Length"] where $imageURL is s-media-cache-ak0.pinimg.com/originals/23/bb/f3/…