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

In php what do you mean by function overloading and function overriding. and what is the difference between both of them? couldn't figure out what is the difference between them.

Does anyone know how I can take a mysql datetime stamp, such as YYYY-MM-DD HH:MM:SS and either parse it or convert it to work in JavaScript's Date() function, such as.. Date('YYYY, MM, DD, HH, MM, SS);

I know, I know, title is quite bad, but I'll try to explain what I mean here. So, I ask my members to show their photos. They upload it somewhere, then paste their photos' URL into input and I save it to my database (MYSQL). Then, the photo is being seen on their profiles. I get the URL from database and do something like that: <img src="<?=$photo;?>" height="123px" width="123px">"> where $photo is URL taken from MYSQL. Is it totally safe? Can somebody upload for example .php file and harm my website? Do I need to check if URL's ending is .gif, .png, .jpg?

So everyone says that sessions have security risks, I want to know what kind of risks are these? What can hackers do with sessions?

I was surprised to learn today that PHP is used widely in high-traffic websites.

i use .htaccess and i have a rule that allow me to dynamically look for product in my database.

I need to test my web app in a scenario where there’s no disk space remaining, i.e. I cannot write any more files. But I don’t want to fill my hard drive with junk just to make sure there’s really no space left. What I want is to simulate this situation withing a particular process (actually, a PHP app).

I am having trouble understanding how apache/php/mysql stack works on a low level (including interaction with the browser). Is there a good description somewhere (a book, a website, etc) that will walk me through the whole path and explaining how starting with a browser reqesting a url, http requests is being sent, how apache talks to php, how php talks to mysql (persistant and non-persistant connections), etc, etc. I want to understand what waits for what in this chain, where timeouts are handled, how long sockets are opened and closed. A book, an article maybe? There is a lot of documentation on each individual component, but I can't find a "walkthrough".

I'm trying to authenticate my users via facebook or userbundle on symfony2

In the PHP 3.0 SDK there is no getSession() or any session handling from outside the Facebook api available. Some days ago the developers of facebook have also somehow updated the JavaScript sdk, according to this blog entry and this bug report .

Or is it just at a 'finished' state? I've used PHPDoc for many years on all my PHP projects, but I recently noticed that the last post on the PHPDoc website was from 2008. So I'm wondering if it's time to look into other alternatives like Doxygen. Are there any advantages to using something other than PHPDoc?

do you know if count() in PHP really counts the all elements of a PHP-array, or if this value is cached somewhere and just needs to be retrieved?

I need to create SEO-friendly urls for my site. I found out I can use .htaccess to rewrite them. So I tried this:

i am creating a new feature on my site that allow people to send postcard to friends. in this section they can choose the image they want to send (they already uplaoded the image to their profile -> my pictures section)

i made a mistake and i have to split 1 table into 2. i have a product table and i need category table. when i started i only had 1 category per product but not (with new business requirement) i need the ability to put a product in multiple category.

I'm trying to convert a Math Formula into PHP code. You can see the formula in the accepted answer here: Applying a Math Formula in a more elegant way (maybe a recursive call would do the trick) .

I have a website (with ESI) that uses Symfony2 reverse proxy for caching. Average response is around 100ms. I tried to install Varnish on server to try it out. I followed guide from Symfony cookbook step by step, deleted everything in cache folder, but http_cache folder was still created when I tried it out. So I figured I could try to comment out $kernel = new AppCache($kernel); from app.php . That worked pretty well. http_cache wasn't created anymore and by varnishstat, Varnish seemed to be working:

I have a website with stories in it. I can have multiple types of stories within multiple categories like:

I am using windows xp x86, wamp, apache2, php 5.3 x86, eclipse php, and xdebug, running on localhost as both a virtualhost and an https virtualhost

For a long time I am looking for a practical (reusable, clear, updateable,...) solution to the following: