Quisque eu tincidunt neque. Duis venenatis aliquam tortor, a accumsan elit fringilla sit amet. Pellentesque tempus, turpis sagittis rutrum adipiscing, nisi felis dapibus nisl, vel mollis purus ipsum vel arcu. Nullam porttitor, mi at hendrerit pellentesque, libero tellus iaculis leo, ac volutpat lectus magna at justo? Etiam sagittis, eros vitae tincidunt tempor, nisi diam ultrices purus, sit amet semper purus orci vel enim. Nulla non elit enim. Donec sem orci, mattis eleifend pharetra ut, vehicula sed ante. Nam sem tellus, malesuada id posuere at, hendrerit id velit! Etiam accumsan interdum ligula fermentum semper. Vestibulum consequat mattis massa, vitae aliquam elit vestibulum a. In hac habitasse platea dictumst. Cras tempor convallis sapien, eget posuere libero venenatis sit amet. Aenean consequat sem vitae massa elementum in tempor justo sollicitudin. Donec tempus varius leo, non pellentesque nibh eleifend eu.

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And its into this maelstrom of DSLR proliferation that Nikon launches its latest baby DSLR, the D5000. The name will come as no surprise to anyone within earshot of the rumor mill but the camera itself may present some more surprises. Having confused many people but made huge ground with its simplified D40 and D60 range, it appears Nikon has again decided that simply replacing models isn’t the best way to address the market. So here we have a camera that genuinely seems to sit above the D60 (rather than continuing in parallel until the stock runs out), and below the D90. Like the baby Nikons, the D5000 doesn’t have an autofocus motor built into the body but does gain a tilt-and-swivel LCD, as a series of leaked images that have made their way around the internet would have you expect.

But this way is hard to extend and hard to maintain. How about adding say_konichiwa() action? We need to add a function and need to add a case in switch statement. For database management system, we need at least 6 actions. Show List View, Add New, Show, Edit, Update and Delete. If we put all those actions to one page like about example, it will be ugly and hard to read. And, we definitely will need to add another action.

We could make Ruby on Rails style Action Controller in easy way. First we need to create .htaccess for RESTful url.

.htaccess

Then, we need to create three scripts. index.php, actions.php and action_controller.php.

index.php

actions.php

action_controller.php (the trick)

That all…

Now, we can access our say_hello actions with…

If we want to add say_konichiwa action, we can simply put say_konichiwa function to actions.php and we can call our action from browser with ( http://domain/project-dir/action/say_konichiwa ). That is easy to maintain, easy to extend and nice (i think ).

Have a nice day…

HTTP is a stateless protocol

HTTP is stateless protocol. A stateless server is a serve that treats each request as an independent transaction that is unrelated to any previous request.

That mean, the request you make doesn’t associate in any way with the previous one. So, how about the request we want to make frequently, like user name or id? As you know, we could store our data in COOKIE. When we store data in COOKIE, the browser will send the cookie data to server for each request. We already could use SESSION for this kind of task. So, what is difference between SESSION and COOKIE?

COOKIE
A cookie is a text-only string that takes a place in the memory of user’s browser. If the lifetime of the cookie is set to be longer than the time user spends at that site, then this string is saved to file for future reference. User could be disabled the cookie in their browser setting.

SESSION
Session values are store in server side not in user’s machine. A session is available as long as the browser is opened. User couldn’t be disabled the session. We could store not only strings but also objects in session.

The Differences
We got three differences in general. The key difference would be cookies are stored in client side and sessions are stored in server side. The second difference would be cookies can only store strings. We can store our objects in sessions. Storing objects in sessions were really useful according to my experience. Another difference was that we could be save cookie for future reference, but session couldn’t. When users close their browser, they also lost the session.