Question

I found a nifty little php function to check whether a url is an image – is there also a way to determine whether that image is e.g. > 1mb?

SOLUTION FOUND:

I found a viable solution here: php how to get web image size in kb?

Answer 1

From: https://stackoverflow.com/a/3894706/187954

<?php
$headers = get_headers('http://humus101.com/wp-content/uploads/2009/11/Hummus-soup.jpg');
$size = null;
foreach($headers as $h){
    /** look for Content-Length, and stick it in $size **/
}
if ($size === null){ //we didn't get a Content-Length header
    /** Grab file to local disk and use filesize() to set $size **/
}

echo "image is $size bytes";