PHP Tutorial #21 The Session How To Create , Modify And Delete A Session by alexendre-maxim

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utopian-io · @alexendre-maxim · Mar 8 '19

$30.08

PHP Tutorial #21 The Session How To Create , Modify And Delete A Session

<html>
<p><img src="https://cdn.steemitimages.com/DQmR2CdPgUAaypJwbE8QhahqDxrabLTM5fHq8ZjTPcVr2fg/bbva-open4u-herramientas-basicas-desarrolladores-php_1.jpg" width="2122" height="1415"/></p>
<p><a href="https://cdn.steemitimages.com/DQmR2CdPgUAaypJwbE8QhahqDxrabLTM5fHq8ZjTPcVr2fg/bbva-open4u-herramientas-basicas-desarrolladores-php_1.jpg">Image Source</a></p>
<h2>Repository</h2>
<p><a href="https://github.com/php/php-src">https://github.com/php/php-src</a> &nbsp;</p>
<h2>What Will I Learn?</h2>
<p>&nbsp;I will learn the session, the concept of a session where we can find &nbsp;it and why we use it , and how to create a session or how to save the &nbsp;information about a user , how to modify these session and delete it.&nbsp;</p>
<ul>
  <li>What's the session.</li>
  <li>How to create a session.</li>
  <li>How to modify a session.</li>
  <li>How to delete a session.</li>
</ul>
<h2>Requirements</h2>
<h5>System Requirements:</h5>
<ul>
  <li>Server support PHP , Xampp or Wamp for example</li>
  <li>An IDE like Sublime text.</li>
  <li>&nbsp;Browser (Chrome for example)&nbsp;&nbsp;</li>
</ul>
<h5>OS Support for PHP</h5>
<ul>
  <li>Windows</li>
  <li>macOS</li>
  <li>Linux</li>
</ul>
<h4>Required Knowledge</h4>
<ul>
  <li>HTML language</li>
  <li>CSS language</li>
</ul>
<h2>Difficulty</h2>
<ul>
  <li>Basic</li>
</ul>
<h2>Description</h2>
<p>&nbsp;In this tutorial we will learn the sessions, how the websites remembers the name or other information about the user who connects in the site.&nbsp;</p>
<p>&nbsp;When you create a website, you need to quickly store and display information about your users to distinguish them or assign them rights of use. The main problem with languages like PHP is that variables have only a limited lifetime to the script that calls them.</p>
<p>&nbsp;To preserve data from page to page, you must pass them through the GET or POST method .This can be binding if we have a lot of data to keep or we do not want to show them to the customer.&nbsp;</p>
<p>&nbsp;Fortunately, we can use a mechanism to store these variables and retrieve them later, there are two ways of storing information, they are both in the form of a file recorded on the disc :&nbsp;</p>
<p>- The cookie that will be on the client side.</p>
<p>- The session that will be server side. &nbsp;</p>
<h3>What's a session ?</h3>
<p>&nbsp;A session is a technical mechanism for temporarily saving information about a user to the server, this system has been invented to overcome the fact that the HTTP protocol operates in offline mode.&nbsp;</p>
<p>&nbsp;Each time a new session is opened the user is assigned a session identifier, This identifier can be transmitted either in GET, POST or Cookie depending on the configuration of the server.&nbsp;</p>
<p>&nbsp;The information will be transferred from page to page by the server and not by the client, In this way the security and integrity of the data are improved and their availability throughout the session.&nbsp;</p>
<p>&nbsp;A session can contain any type of data (number, string and even an array ), unlike a database or file system the session keeps the information for a few minutes, this time depends on the server configuration but is usually set to 24 minutes by default. The server creates files stored in a particular directory.</p>
<h3>Create a session</h3>
<p>&nbsp;PHP introduces a unique natively function to start or continue a session, this is <code>session_start()</code>, this function doesn't take a parameter and always returns true, it checks the status of the current session.&nbsp;</p>
<p>&nbsp;If it doesn't exist the server creates it, else it pursues it in the case of use of sessions with cookies, the function <code>session_start()</code> must be called before sending to the browser.&nbsp;</p>
<p>&nbsp;When a session is created it's empty by default it has no interest, it must therefore be assigned values to save temporarily, for that the PHP language sets up the <code>$_SESSION</code> superglobal array.&nbsp;</p>
<p>The array <code>$_SESSION</code> can be indexed numerically but also associatively, in general the second is preferred in order to be able to give meaningful and meaningful names of session variables.&nbsp;</p>
<p>&nbsp;The example that I want to do is a login page after that I will allow the user to publish something with his username, we will not ask in each task the username of the user, for example in facebook we connect and after we can publish, comment, discuss .. etc with our username, facebook doesn't need to ask each time to enter the username just the first time and will save it using the session.</p>
<p><img src="https://cdn.steemitimages.com/DQmYYcjDHdsZ9TChsvfSM2mw2yXYzXWoVK476tuZxmo7iTo/capture-20190308-113649.png" width="891" height="195"/></p>
<p>I have created a form with <code>action="SessionLogin.php"</code> and the <code>method="post"</code> I will send the values to the SessionLogin page</p>
<p>&nbsp;<img src="https://cdn.steemitimages.com/DQmcu8Z8WUeuvCE4WjAHH7o7QfgLE2rVzbSjhMw8y1dpB4e/capture-20190308-114505.png" width="532" height="163"/></p>
<p>I will get the username and the password in the next page to create the session</p>
<p><img src="https://cdn.steemitimages.com/DQmRz7EQMvJ13b1z5bmZQeo8Zyq85Ri5dYQZcgaJYxD7RTT/capture-20190308-113723.png" width="778" height="261"/></p>
<p>I will get the <code>$username</code> and <code>$password</code> then I will create the session ' <code>$_SESSION['username'] = $username</code> ' in the array <code>$_SESSION</code> I will add the key username and the value that the user entered, the <code>header("Location: publish.php")</code> will redirect the user to the <code>publish.php</code> page</p>
<p><img src="https://cdn.steemitimages.com/DQmTB9knPcpr8f96WqBR4gzYGs1EiCp58r6EHXXZWNB3Azy/capture-20190308-114205.png" width="1019" height="625"/></p>
<p>In the publish.php page I have two forms a form for logout and a form to publish an article with a title and content , the idea that I will get the title and content and also the username using the SESSION , this is the result</p>
<p><img src="https://cdn.steemitimages.com/DQmYanFjsJwz6mXHze3Br3N2VE8QPn9AJD4EtZrfXJtRyH4/capture-20190308-114545.png" width="536" height="481"/></p>
<h3>Modify a session</h3>
<p>&nbsp;To modify a session you need to replace the value of the key saved in the <code>$_SESSION</code> array with another value that the user entred using the input for example.</p>
<p>I have entered the username " Alexendre " I will just change it because am the same user I will change it to any other username and the result in the publish page will be " Maxim " for example.</p>
<p><img src="https://cdn.steemitimages.com/DQmSETXNgeW5kYAe9unAqonjasD6N39NjifrCQaXEuqNwP5/capture-20190308-132515.png" width="705" height="149"/></p>
<p><img src="https://cdn.steemitimages.com/DQmVMnFHP97fkYmP88ck3tQwW66c2pmaXvPiDm5ApDrQoPG/capture-20190308-132614.png" width="511" height="478"/></p>
<h3>Destroy a session &nbsp;</h3>
<p>&nbsp;As mentioned above the server itself destroys the session after a certain time if the session hasn't been renewed.&nbsp;</p>
<p>&nbsp;On the other hand it's possible to force its destruction by means of the function <code>session_destroy()</code>, this function allows for example webmasters to propose a logout page to members logged in their personal space, for that you need to use this function to delete or to destroy the session created . &nbsp;</p>
<p>I will use logout to delete the session of the user and to do that I need to go to another page and use the <code>unset()</code> and <code>destroy()</code> methods</p>
<p><img src="https://cdn.steemitimages.com/DQmaAJY3SqeG4qM5uvq6nwaNJy6u9HrTmAZeHpEv7Vwqozy/capture-20190308-114311.png" width="372" height="240"/></p>
<p>I will firstly start the session then the methods unset and destroy and I will print the array and " You have disconnected "</p>
<p><img src="https://cdn.steemitimages.com/DQmX1F24iXfmiCjXzNxuveq6F4SPfa1dyoBMDBHuQLtAKfg/capture-20190308-132947.png" width="537" height="84"/></p>
<p>And if we open the publish page without session ( we have deleted the session ) , this is the result</p>
<p><img src="https://cdn.steemitimages.com/DQmbjBFoi8t4h6xmUQKSnLXag6pBYL8b4TRHhkwcjR7pRZq/capture-20190308-133035.png" width="1061" height="546"/></p>
<h2>Video Tutorial&nbsp;&nbsp;</h2>
<p>https://www.youtube.com/watch?v=PGiVOpc35w0&amp;feature=youtu.be</p>
<h2>Curriculum</h2>
<ul>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-11-string-methods-addslaches-chr-chop-and-chunksplite">PHP Tutorial #11 String Methods ( Addslaches, Chr, Chop and Chunk_splite )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-12-string-methods-bin2hex-countchars-explode-and-hex2bin">PHP Tutorial #12 String Methods ( Bin2Hex, Count_Chars, Explode and Hex2Bin )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-13-string-methods-implode-join-lcfirst-ltrim-and-fprintf">PHP Tutorial #13 String Methods (Implode, Join, Lcfirst, Ltrim and Fprintf )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-14-string-methods-md5file-md5-nl2br-and-addcslaches">PHP Tutorial #14 String Methods (Md5_File, Md5, Nl2br and Addcslaches )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-15-string-methods-numberformat-ord-parsestr-print-and-printf">PHP Tutorial #15 String Methods (Number_Format, Ord, Parse_Str, Print and Printf )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-16-string-methods-quotemeta-rtrim-sha1file-and-sha1">PHP Tutorial #16 String Methods (QuoteMeta, Rtrim , Sha1_file and Sha1 )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-17-mathematical-methods-abs-acos-acosh-and-asin">PHP Tutorial #17 Mathematical Methods (Abs, Acos , Acosh and Asin )</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-18-get-and-post-methods-and-usdserver-variables">PHP Tutorial #18 ( GET and POST ) Methods and $_SERVER Variables</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-19-include-and-require-globals-variable-request-and-usdserver-variables">PHP Tutorial #19 ( Include and Require ) , Globals Variable, Request and $_SERVER Variables</a></li>
  <li><a href="https://steemit.com/utopian-io/@alexendre-maxim/php-tutorial-20-the-cookie-how-to-create-modify-and-delete-a-cookie">PHP Tutorial #20 The Cookie How To Create , Modify And Delete A Cookie</a></li>
</ul>
<h2>Proof of Work Done</h2>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/login.html</p>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/SessionLogin.php</p>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/publish.php</p>
<p>https://github.com/alexendre-maxim/PHP-Tutorial/blob/master/logout.php</p>
</html>

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vote details (126)

voter	rshares	pct
tombstone	2,726,809,237,472	11.45%
roy2016	148,469,411,290	26%
abh12345	18,453,245,539	2.86%
techslut	80,978,165,604	20%
minersean	8,408,643,549	75%
erikaflynn	16,527,016,922	35%
miniature-tiger	105,807,823,767	50%
jakipatryk	14,941,173,101	50%
jga	1,667,692,118	14.32%
helo	53,932,532,306	25.34%
walnut1	28,998,973,054	14.32%
lorenzor	790,785,461	7.16%
suesa	117,795,813,826	25%
codingdefined	28,171,008,777	20%
tsoldovieri	1,024,111,927	7.16%
bachuslib	20,476,606,487	100%
tykee	7,864,552,175	14.32%
iamphysical	15,803,633,646	90%
felixrodriguez	540,839,827	5.01%
azulear	517,394,540	100%
silviu93	3,542,143,172	14.32%
jadabug	1,344,226,092	1%
dakeshi	3,137,149,664	50%
accelerator	6,721,373,174	0.43%
eastmael	7,948,994,815	50%
espoem	45,062,726,219	24.25%
mcfarhat	18,466,122,763	10.13%
vishalsingh4997	106,076,451	14.32%
elear	4,433,006,113	28.64%
zoneboy	11,163,279,622	50%
carloserp-2000	32,125,766,424	100%
carlos84	880,222,773	14.32%
che-shyr	899,618,479	50%
utopian-io	35,909,411,331,000	28.64%
jaff8	55,586,831,168	25.34%
newsrx	88,114,631	7%
amestyj	331,338,174	7.16%
mcyusuf	1,410,082,292	14.32%
alexs1320	65,283,162,208	51%
ivymalifred	233,871,911	7.16%
r00sj3	158,858,628	0.71%
aussieninja	5,511,278,065	14.32%
ennyta	94,385,281	7.16%
vjap55	894,883,754	100%
amosbastian	77,535,370,006	25.34%
eliaschess333	1,355,153,448	7.16%
tdre	80,468,830,756	100%
ydavgonzalez	367,746,377	1%
scienceangel	70,966,054,537	50%
jjay	501,316,425	100%
vanarchist	2,715,939,444	100%
sargoon	4,367,487,654	100%
tobias-g	127,157,873,852	40%
miguelangel2801	71,270,975	7.16%
didic	33,336,116,326	25%
emiliomoron	475,568,229	7.16%
ulisesfl17	1,844,234,348	100%
arac	1,013,371,542	100%
alexendre-maxim	8,034,511,857	100%
reazuliqbal	43,517,323,072	25%
properfraction	2,184,533,905	100%
tomastonyperez	1,558,005,857	7.16%
elvigia	1,428,214,050	7.16%
ezravandi	4,830,199,208	1.5%
luiscd8a	1,646,927,098	80%
ayay	93,737,359	11%
eniolw	8,203,728,962	100%
josedelacruz	647,852,255	7.16%
joseangelvs	286,104,101	14.32%
viannis	187,762,311	7.16%
flores39	408,145,469	100%
erickyoussif	577,043,225	14.32%
ryuna.siege	208,727,246	100%
clayjohn	6,409,334,244	100%
anaestrada12	2,376,086,154	14.32%
joelsegovia	396,019,206	7.16%
jesusfl17	414,405,727	100%
bflanagin	2,353,354,499	14.32%
ubaldonet	3,356,609,222	70%
dalz	4,278,346,940	11.45%
ulockblock	29,769,592,815	9.22%
zuerich	60,237,537,235	15%
amart29	230,235,616	3.58%
samptoterdo	466,353,575	100%
riodronthedi	477,196,262	100%
omakkeman	519,599,138	100%
zoetz2g4baker	518,993,126	100%
dssdsds	2,166,319,982	14.32%
jayplayco	64,569,284,737	14.32%
elizabethc7	531,421,062	100%
cryptouno	478,606,218	5%
steeming-hot	0	0.02%
lupafilotaxia	14,624,645,831	100%
fran.frey	219,663,614	7.16%
alaiza	471,171,797	100%
mops2e	249,022,129	19.4%
jrevilla	68,803,310	14.32%
rachelcku	518,721,521	100%
swapsteem	1,317,374,908	14.32%
stem-espanol	8,248,134,638	14.32%
lapp	473,498,800	100%
steemtpistia	472,978,998	100%
crassipes	473,222,355	100%
encrawunria	531,323,002	100%
nkilehisli	530,741,620	100%
riounelrarop	532,641,542	100%
quidawelchphleb	487,687,822	100%
uncerfeivas	518,531,902	100%
booksrepchipa	529,392,102	100%
agrovision	473,498,603	100%
steem-ua	721,977,665,456	7%
giulyfarci52	109,196,583	7.16%
kaczynski	143,825,926	100%
optimizer	3,827,496,247	2.61%
alex-hm	1,173,013,703	50%
bluesniper	763,251,619	0.26%
mrsbozz	228,328,685	7%
ascorphat	1,813,391,970	2.5%
rewarding	5,819,628,040	64.31%
jk6276.mons	1,207,373,019	28.64%
hamsa.quality	1,425,513,281	1%
curation.trail	1,104,074,527	1.8%
xrp.trail	861,271,695	1.3%
jaxson2011	1,052,558,162	28.64%
eternalinferno	122,408,200	28.64%
utopian.trail	11,435,578,344	28.64%

@crypto.talk · Mar 9 '19

Hello alexendre-maxim, welcome to Partiko, an amazing community for crypto lovers! Here, you will find cool people to connect with, and interesting articles to read!

You can also earn Partiko Points by engaging with people and bringing new people in. And you can convert them into crypto! How cool is that!

Hopefully you will have a lot of fun using Partiko! And never hesitate to reach out to me when you have questions!

Cheers,
crypto.talk
Creator of Partiko

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@alexendre-maxim · Mar 11 '19

Thank you @crypto.talk

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@rosatravels · Mar 9 '19

$11.40

Hi @alexendre-maxim

I can see an overall improvement in your  tutorial in terms of outline, the structure and also the presentation.

You are putting emphasis in diction and therefore making your presentation clear and easy to understand.  This is very important especially when English is your second language.

So far, this is the best video tutorial you have submitted.

Rosa

P.S.  I also sent a DM to your discord.  Can you check?


Your contribution has been evaluated according to [Utopian policies and guidelines](https://join.utopian.io/guidelines), as well as a predefined set of questions pertaining to the category.

To view those questions and the relevant answers related to your post, [click here](https://review.utopian.io/result/9/2-1-2-2-2-2-1-1-3-).

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@alexendre-maxim · Mar 11 '19

Thank you @rosatravels , I am very happy to see that .

properties (22)

@utopian-io · Mar 12 '19

Thank you for your review, @rosatravels! Keep up the good work!

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@steem-ua · Mar 9 '19

#### Hi @alexendre-maxim!

Your post was upvoted by @steem-ua, new Steem dApp, using UserAuthority for algorithmic post curation!
Your post is eligible for our upvote, thanks to our collaboration with @utopian-io!
**Feel free to join our [@steem-ua Discord server](https://discord.gg/KpBNYGz)**

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@alexendre-maxim · Mar 11 '19

Thank you @steem-ua

properties (22)

@steem-ua · Mar 9 '19

#### Hi @alexendre-maxim!

Your post was upvoted by @steem-ua, new Steem dApp, using UserAuthority for algorithmic post curation!
Your post is eligible for our upvote, thanks to our collaboration with @utopian-io!
**Feel free to join our [@steem-ua Discord server](https://discord.gg/KpBNYGz)**

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@alexendre-maxim · Mar 11 '19

Thanks

properties (22)

@utopian-io · Mar 10 '19

Hey, @alexendre-maxim!

**Thanks for contributing on Utopian**.
We’re already looking forward to your next contribution!

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@alexendre-maxim · Mar 11 '19

Thank you

properties (22)