getimagesize function doesn't return anything

Question

I am using php function getimagesize(). It does work in almost all condition but it doesn't work for a particular url. Please help me why isn't it working for that url. Below you can check that url:

getimagesize('https://marketdataresearch.credit-suisse.com/cs/mdr/p/s/framework10/img/logo_cs.gif');

It returns nothing and not giving any error.

Answer 1

That specific URL actually has some rudimentary security behind it. If you use curl to fetch that URL you will see the following location header:

Location: /cookie-check?trg=insanely-long-strong

When you follow that, you just end up on a regular HTML page. What you're trying to do won't be possible without fetching the cookie, using the cookiejar in a curl request, downloading the file, and running getimagesize against the local file.