CCNA, CCNP, MCSA, CCNA Final Exam, All Answer Test Module With 100/100

I am looking to create a system which on signup will create a subdomain on my website for the users account area.

What is the correct way to log out of HTTP authentication protected folder?

Question Part A ▉ (100 bountys, awarded) Main question was how to make this site, load faster. First we needed to read these waterfalls. Thanks all for your suggestions on the waterfall readout analysis. Evident from the various waterfall graphs shown here is the main bottleneck: the PHP-generated thumbnails. The protocol-less jquery loading from CDN advised by David got my bounty, albeit making my site only 3% faster overall, and while not answering the site's main bottleneck. Time for for clarification of my question, and, another bounty:

When would you consider using one over the other and why?

I'm setting up a new server, and want to support UTF-8 fully in my web application. I have tried in the past on existing servers and always seem to end up having to fall back to ISO-8859-1.

Almost everyone has a Facebook account, even people who are not familiar with the Internet. With millions people actively using Facebook, updating their status, replying to messages, uploading photos and so on, how is Facebook's page still loading very fast?

What is this? This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

What would you recommend using between a datetime and a timestamp field, and why? (using mysql). I'm working with php on the server side.

So specifically in a mysql database, I understand that this is vulnerable to SQL injection . Take the following code and tell me what to do.

I'm using the America/New York timezone. In the Fall we "fall back" an hour -- effectively "gaining" one hour at 2am. At the transition point the following happens:

We have all heard of how in a for loop, we should do this:

I have been browsing this site for the answer but I'm still a little unsure how to plan a similar system in its database structure and implementation.

This is a design question. I have data that needs to go into an HTML table, which will later be manipulated by the user. Basically the user will be able to select items in the table rows.

I am refurbishing a big CMS that I have been working on for quite a number of years now. The product itself is great, but some components, the Database and translation classes for example, need urgent replacing - partly self-made as far back as 2002, grown into a bit of a chaos over time, and might have trouble surviving a security audit.

According to the PHP manual , a class like this: abstract class Example {}

Given any character from a to z, what is the most efficient way to get the next letter in the alphabet using PHP?

I have Yslow add-on installed When I checks my application in Yslow I get Add Expires headers which I don't know

I have rules in my .htaccess for pages, show property id etc...

Currently on my site I'm using statements like: include 'head.php'; include '../head.php'; include '../../head.php';

I want to deny direct access to all .php files except one: index.php