Conditional doesn't trigger error, but doesn't work?

delayedinsanity · 08-17-2008, 02:17 AM

So in my effort to reduce using functions such as preg_match, I tried this little bit of code in a method today:

PHP Code:


			
        if ($list_type != ('categories' || 'versions'))
        {
            trigger_error('Invalid list type', E_USER_NOTICE);
            return;
        }

This doesn't produce any errors or notices, but neither does it work as I hoped it would. How come? I'm using the following instead...

PHP Code:


			
        if (! in_array($list_type, array('categories', 'versions')))
        {
            trigger_error('Invalid list type', E_USER_NOTICE);
            return;
        }

...but you would think if PHP accepted the original as valid code, it would produce some kind of result.
-m