PHP-and-MySQL/C4/Cookies-Part-2/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:00 | Welcome back. Just to summarize - in the first part of the cookie tutorial, we learnt how to create cookies, how to give an expiry date to the cookie and how to print out specific cookies. |
| 00:13 | Using this command here, we also learnt how to print out every cookie that we had stored. |
| 00:18 | So, assuming that we have created these cookies, the next thing I'll do is - use this specific cookie here that I have created, to check whether it does exist or not. |
| 00:28 | To do so, we will use a function called isset(). |
| 00:32 | This basically returns a true or false value depending on whether something is set or not. |
| 00:37 | For example, a cookie. I'll put a dollar sign then underscore cookie. |
| 00:42 | And I'll put 'name' in here. |
| 00:46 | So, if I read this out in English language then I'll say - |
| 00:49 | If the cookie name is set then we say echo “Cookie is set”. |
| 00:57 | Otherwise we will echo out to the user that "Cookie is not set". |
| 01:01 | Assuming that I have set my cookie and everything is working, when I refresh this I'll get the message that the "Cookie is set". |
| 01:11 | Now I'll teach you how to 'unset' a cookie. |
| 01:14 | So, let's say over here - just before our if statement, I wish to unset my cookie. |
| 01:20 | So, unset a cookie. So, just to name one, I'll unset this cookie, |
| 01:25 | presuming that if you learn to unset this one, you can unset this one too. |
| 01:31 | So, I'll unset this "name" cookie. |
| 01:34 | So, to unset, we use the same command and that’s 'setcookie()'. |
| 01:39 | So we are resetting a cookie. |
| 01:41 | This doesn’t seem to make any sense but it will soon. |
| 01:45 | Now we will set the cookie name to nothing. |
| 01:49 | And our expiry date here... |
| 01:51 | I'll create a new one with "$exp_unset" |
| 01:55 | and that is gonna equal to the time minus 86400. |
| 02:01 | Here, we said plus which meant that the time is in the future. |
| 02:05 | Now by setting the cookie to this variable which represents a time in the future, we are actually unsetting the cookie. |
| 02:13 | So. if I were to say - set a cookie that already exists called name, to 'no value' at all. |
| 02:20 | And use “$exp_unset” variable to set it to a time in the future, thereby 'unsetting' our cookie. |
| 02:28 | So, I'll get rid of this code for now and run this page, okay? |
| 02:34 | Nothing has happened presuming my cookie is unset. |
| 02:40 | Now I want to get rid of this code - so I'll comment this out. |
| 02:45 | And I'll put my if statement back into the page. |
| 02:48 | Now presuming this says - is the cookie set name? I'm going to unset the cookie which should get the result "Cookie is not set". |
| 02:56 | Let's refresh and we got "Cookie is not set". |
| 03:02 | And then from here you can set it again if you like and you can change the values of the cookie. |
| 03:08 | To change the value of a cookie, you'll have to use 'setcookie()' command again. |
| 03:13 | You’ll say - set cookie "name" and here just type a new value. |
| 03:17 | So, it's not hard to work with cookies. |
| 03:19 | It's quite an easy process. |
| 03:21 | And it’s a very very useful thing in php. |
| 03:23 | So, use it to your heart’s content. Okay. Thanks for watching. |
| 03:27 | If you have any questions, please let me know. |
| 03:30 | This is Evan Varkey, dubbing for the Spoken Tutorial Project. Bye. |
