Pravin1389: moved PHP-and-MySQL/C4/Cookies-(Part 1)/English to PHP-and-MySQL/C4/Cookies-Part-1/English

2012-12-01T15:05:07Z

moved PHP-and-MySQL/C4/Cookies-(Part 1)/English to PHP-and-MySQL/C4/Cookies-Part-1/English

Chandrika: Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on php cookies. |- |0:04 |Cookies are a very important part when creating special websites where you store inform…'

2012-11-29T06:53:49Z

Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on php cookies. |- |0:04 |Cookies are a very important part when creating special websites where you store inform…'

New page

{|Border=1
!Time
!Narration
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|0:00
|Welcome to this tutorial on php cookies.
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|0:04
|Cookies are a very important part when creating special websites where you store information about a user.
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|0:11
|The definition of a cookie is a set of data stored on your computer or the user's computer by the web server.
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|0:18
|This means, that when we go to a website, our details are stored and are used when we visit it again, provided we select an option like 'Remember me'.
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|0:30
|So you don't have to keep logging in.
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|0:32
|But if you didn't check a button like 'remember me', you will probably be dealing with sessions which close as soon as the user closes the browser.
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|0:42
|So sessions are killed straight away however cookies are stored for later use.
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|0:50
|So lets begin right away and see how to create a cookie.
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|0:53
|You do this by using the setcookie function.
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|0:55
|The function takes 5 parameters but I will use just 3.
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|1:00
|The first vital one I will use is the name of the cookie which I will set to 'name'.
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|1:05
|The second one is the data that needs to be stored inside this cookie and I'll type Alex here.
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|1:12
|Now the next one's a bit more tricky.
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|1:15
|Its the time in which it expires.
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|1:18
|Now this needs to be set in seconds.
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|1:21
|And to represent this I am going to create a variable called 'exp' for expire and this will be equal to the time.
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|1:28
|Let me add some value here.
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|1:31
|At the moment I am adding zero.
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|1:33
|So if I echo this out and get rid of this cookie function for now.
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|1:39
|I'm just echoing out the time here just to show you what it does.
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|1:43
|So lets refresh. So you can see quite a lot of digits here.
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|1:47
|Now this is the unique time-stamp.
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|1:50
|And the unique time-stamp is the number of seconds before January the 1st 1970.
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|1:56
|So January the 1st at 12 am ummmm...... in the year 1970.
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|2:02
|So you can see it here - I think the number of seconds in here equates to a date in the future.
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|2:10
|So for example, at this moment you can see this 88, now 89 and as I keep refreshing, by every second this increases.
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|2:20
|So yes, this is quite useful way of adding a specific value here.
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|2:28
|Now we need to find out the time in seconds of a day because I want this cookie to expire in a day.
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|2:34
|So I multiply 24 by 60 to get the number of minutes in a day.
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|2:39
|And then multiply the answer by 60 to get the number of seconds in a day which is 86,400.
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|2:47
|So if I replace zero with 86400, we have the variable "expire" that now holds the time in the future by a day.
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|2:56
|To save time, I am copying this and I will add my expire variable here.
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|3:02
|So this function will set our cookie called 'name' with a value of 'Alex' and it will expire in a day - read in seconds using the time function here.
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|3:13
|So lets refresh this page and hey! we can see we have no errors which means it has worked.
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|3:19
|Now what I'll do is I'll use block commenting to comment out all of these.
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|3:23
|And below this I'll echo out this cookie.
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|3:26
|But the reason I have commented this is because you don't need to set a cookie every time the user comes into the page.
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|3:33
|If you are using a log in script and you let the user log into your website, you would need to issue this only once and then the cookie will be stored.
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|3:41
|And you could use it within this time that we have set here.
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|3:46
|So what I'll do is I'll set echo and I'll use a dollar sign, sorry, underscore cookie.
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|3:52
|Inside here is the name of the cookie so I'll type 'name'. Refresh and you can see 'Alex'.
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|3:59
|You can check it out. Even if I close my browser, restart my computer and came back into this page, it will still read Alex because its been stored into the computer.
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|4:11
|Okay now if had to set another cookie, let's say, I set another cookie here and this will be 'age' and my age is 19.
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|4:24
|And my expiry time I'll just keep as this.
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|4:29
|So lets just put this up here.
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|4:31
|We can replace the block commenting with line-comment to keep it neat.
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|4:36
|So for our expiry time I'll set another cookie in here.
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|4:41
|And that’ll have the same expiry time. Lets see if I can get it right.
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|4:46
|Okay so we'll get rid of this.
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|4:48
|We’ve set another cookie with the same expiry time.
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|4:51
|Lets refresh. Okay that has been set.
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|4:55
|So what I'll do is comment this out and here I will echo it out.
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|5:01
|So you see we can set more than one cookie in a page. Lets refresh that and we can get 19.
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|5:07
|Now we can also set a cookie in a single sentence.
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|5:11
|For that I'll type echo underscore cookie, name and the concatenate "is" and then concatenate my age.
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|5:27
|Therefore we will have a sentence saying Alex is 19 just from the cookies that we've stored.
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|5:34
|And again if I close my browser or restart my computer or come back two hours later, this information will still be there stored on this computer ready to be used by this page.
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|5:44
|So you can see that they are really very useful to use and really easy to create as well and easy to echo out the user.
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|5:53
|Now there's a function we can use called 'print r' or 'print underscore r'.
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|5:58
|And we can echo out 'dollar underscore cookie' here. We can align it a bit later...
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|6:05
|Refresh this and you can see we've got an array here and we have a different value.
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|6:12
|We have got name and that is equal to Alex and we've got an age which is equal to 19.
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|6:22
|So these are cookies and they have been set and these are the values of the cookies.
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|6:27
|This can be very useful if you want to echo this out to yourself.
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|6:31
|Okay now there is another function which I will cover in the second part of this tutorial and I'll use an 'if' statement to find out if a cookie is set or not.
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|6:41
|And I'll also show you how to unset a cookie.
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|6:45
|So join me in part 2 and thanks for watching. This is Evan Varkey dubbing for the Spoken Tutorial Project. Bye.

← Older revision	Revision as of 15:05, 1 December 2012
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PHP-and-MySQL/C4/Cookies-Part-1/English - Revision history

Pravin1389: moved PHP-and-MySQL/C4/Cookies-(Part 1)/English to PHP-and-MySQL/C4/Cookies-Part-1/English

Chandrika: Created page with '{|Border=1 !Time !Narration |- |0:00 |Welcome to this tutorial on php cookies. |- |0:04 |Cookies are a very important part when creating special websites where you store inform…'