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Start with the hints the error message gives you to fix the 500 response.

You tell us. I see no error.

Google is your friend.

You've already asked this; don't start another thread with the same topic when the first is still so recent (it might be another matter if the other thread was a few years old). essellar gave you a great answer; read what he wrote, work on understanding it and follow his advice. You're coming...

Setting an explicit width on .thumbscontainer means it won't properly be fluid (shrink-wrapping to the thumbnails), which is one of the requirements. If you remove both the "inline-block" display and auto-margins for .thumbscontainer, there won't be any properties that center it, nor will the...

Backslashes should be URI-escaped in URI paths, so you'll need to account for this in your rewrite condition: RewriteCond %{REQUEST_URI} ^(.*)(\\|%5C)(.*)$ RewriteRule .* %1/%3 [R=301,NC,L] However, using Apache to change backlashes to forward slashes is inefficient as it will only change one...

No function cares about any variable name used to hold data passed to the function. That's largely the point of formal parameters. In fact, variable names don't really matter to programs. You can change a variable name to anything else as long as you a) do it consistently and b) don't use a...

Setting the width of .thumbscontainer to "inherit" defeats the purpose of auto-margins for centering. One option is to try removing that. Since you're already making use of "inline-block" (which has poor-to-no support in older browsers), another option is to give a.thumbnail inline-block...

By reading the link from the first time I mentioned it, which is why I said to read my sig in my previous post.

That's supposed to be a minimal sample, not a dump of the entire file. Read my sig.

Start by learning ventriloquism. Go to your nearest local bookstore and pick up "Practical Ventriloquism" by Robert Ganthony. Read past the racist language and perfect your art. Make a sock puppet with black button eyes, red yarn arms and a felt mustache to practice with. Name it "Lord Flavius...

It should be a minimal sample, one that has just enough code to reproduce the issue but no more. "Complete" and "concise" are the watchwords. Since the error is reported as arising in inc.functions.php, start there. I'm not sure why you mention a CSS file. Unless the CSS is generated by PHP...

@mttheopfor: If you run your pages through a validator, you'll see there are missing close tags, as well as other problems that should be fixed. @midataz: Don't threadjack. When you start your own thread, explain your problem. As it is, there's no way of answering your question as it isn't...

Server side (as essellar explains), not client side. What does he say that you take to mean this? By "beginning of [your] website's directory", do you mean the document root, the "first" folder in the document root (there's no unique ordering of siblings in a filesystem, so "first" isn't...

W3Schools is outdated, inaccurate and incomplete. CSS won't help here. You need to use some form of includes, which HTML doesn't support. Thankfully, there are other web technologies (such as PHP and server-side includes) that do. The topic has already been covered many times on these forums...

No need to apologize for being a novice. What's important is that you make an effort (don't be the bad kind of lazy) to learn, and use your head. It's never too late to start a new thread if you've got a new topic. This question isn't intelligible. What do you mean by "fetch"? The normal...

The appropriate place would be the Free Hosting forum. This forum (as described in the rules and guidelines, which is the first sticky post in this forum) is "for threads if you need help coding." What do you consider "so long"? It can take a few days, depending on how many people have been...

Environment variables are accessible in PHP via the $_ENV super global. As for the rest of your post, there may be a real question struggling to get out, but it hasn't succeeded. Of course you can use only some Apache configuration settings from a given setup. However, you haven't specified...

Another way of thinking about it is URLs and filesystem paths belong to different namespaces, similar to how variable and function names are in different namespaces in PHP, as are HTML element IDs and classes. Street addresses and phone numbers provide another example. Starting a new thread is...

We also need a complete yet concise code sample and a link to a live page. Read my sig for more.