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Showing posts with label PHP Cookies. Show all posts
Showing posts with label PHP Cookies. Show all posts

php session

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PHP Sessions
A PHP session variable is used to store information about, or change settings for a user session. Session variables hold information about one single user, and are available to all pages in one application.

PHP Session Variables
When you are working with an application, you open it, do some changes and then you close it. This is much like a Session. The computer knows who you are. It knows when you start the application and when you end. But on the internet there is one problem: the web server does not know who you are and what you do because the HTTP address doesn't maintain state.

A PHP session solves this problem by allowing you to store user information on the server for later use (i.e. username, shopping items, etc). However, session information is temporary and will be deleted after the user has left the website. If you need a permanent storage you may want to
store the data in a database.
Sessions work by creating a unique id (UID) for each visitor and store variables based on this UID.
The UID is either stored in a cookie or is propagated in the URL.

Starting a PHP Session
Before you can store user information in your PHP session, you must first start up the session.
Note: 
The session_start() function must appear BEFORE the <html> tag


<?php session_start(); ?>
<html>

<body>
</body>
</html>   

The code above will register the user's session with the server, allow you to start saving user
information, and assign a UID for that user's session.

Function in session
Destroying session
Storing value in session

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remove cookie value in php

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How to Delete a Cookie?
When deleting a cookie you should assure that the expiration date is in the past.
Delete example:

<?php
// set the expiration date to one hour ago
setcookie("user", "", time()-3600);
?>
What if a Browser Does NOT Support Cookies?

If your application deals with browsers that do not support cookies, you will have to use other
methods to pass information from one page to another in your application. One method is to pass
the data through forms (forms and user input are described earlier in this tutorial).
The form below passes the user input to "welcome.php" when the user clicks on the "Submit"
button:


<html>
<body>
<form action="welcome.php" method="post">
Name:<input type="text" name="name" />
Age: <nput type="text" name="age" />
<input type="submit" />
</form>
</body>
</html>

Retrieve the values in the "welcome.php" file like this:

<html>
<body>
Welcome <php echo $_POST["name"]; ?>.
You are <php echo $_POST["age"]; ?> years old. 
<body>
<html>

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retrieve data from cookie php

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How to Retrieve a Cookie Value?
The PHP $_COOKIE variable is used to retrieve a cookie value.
In the example below, we retrieve the value of the cookie named "user" and display it on a page:

<?php
// Print a cookie
echo $_COOKIE["user"];
// A way to view all cookies
print_r($_COOKIE);
?>
In the following example we use the isset() function to find out if a cookie has been set:

<html>
<body>
<?php
if (isset($_COOKIE["user"]))
{
echo "Welcome " . $_COOKIE["user"] . "!";
}
else
{ echo "Welcome guest!";
}
?>
</body>
</html>

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PHP Cookies

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PHP Cookies
A cookie is often used to identify a user.
What is a Cookie?
A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.
How to Create a Cookie?
The setcookie() function is used to set a cookie.
Note:
          The setcookie() function must appear BEFORE the <html> tag. 
 Syntax
setcookie(name, value, expire, path, domain);
Example
In the example below, we will create a cookie named "user" and assign the value "Alex Porter" to it. We also specify that the cookie should expire after one hour:

<?php
setcookie("user", "Alex Porter", time()+3600);
?>
Note:
The value of the cookie is automatically URLencoded when sending the cookie, and automatically decoded when received (to prevent URLencoding, use setrawcookie() instead).

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