Description:
------------
Welcome.

My report is related to the function:
bool class_exists (string $ class_name [, bool $ autoload = true])

Namely, I have noticed that if the result of the function returns false, the 
script crashes mistake, because after all, the script tries to load a non-
existent class. Problem solved by changing the parameter $ autoload to false.

I believe that the $ autoload should be taken into account only if the result of 
the function will amount to true.

I'm sorry for syntax errors. My text was translated Google tools - translation.

Regards,
Kamil Piechaczek

Test script:
---------------
if( class_exists('finfo', false) ) {
    $fInfo = new finfo(FILEINFO_MIME);
    $gravatarImageMime = $fInfo->file($gravatarURL, FILEINFO_MIME_TYPE);
} else {
    $gravatarImage = getimagesize($gravatarURL);
    $gravatarImageMime = $gravatarImage['mime'];
}

Expected result:
----------------
Variable $gravatarImageMime should has type mime of file.

Actual result:
--------------
White screen (autoload can't find file)