Questions and Answers
What is the purpose of using cookies in PHP?
Cookies are used for session tracking, maintaining data across multiple visits, holding shopping cart contents, storing login details, and more.
How can you set a cookie in PHP?
You can set a cookie in PHP using the setcookie function, specifying parameters such as name, value, expiration time, path, and domain.
How do you retrieve the value of a cookie in PHP?
You can retrieve the value of a cookie in PHP by accessing the $_COOKIE superglobal array.
How can you delete a cookie in PHP?
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How can you set a cookie to expire in 1 hour in PHP?
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What is a cookie in the context of web development?
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How is a cookie created in PHP?
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Cookies can store up to 8 KB of data on the client's computer.
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Cookies can be accessed in PHP using the ______ superglobal array.
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Match the following cookie parameters with their descriptions:
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Study Notes
Persistence
- Persistence is the ability of data to outlive the execution of the program that created them.
Persistence and HTTP
- HTTP is a stateless protocol, which means it remembers nothing about previous transfers.
- Two ways to achieve persistence are:
- PHP cookies
- PHP sessions
Cookies
- A cookie is an item of data that a web server saves to a user's computer's hard disk via a web browser.
- Cookies can contain almost any alphanumeric information (as long as it's under 4 KB) and can be retrieved from the user's computer and returned to the server.
- Common uses of cookies include session tracking, maintaining data across multiple visits, holding shopping cart contents, and storing login details.
Using Cookies in PHP
- Script sends a simple name and value to the client, which saves it in the file system.
- The client returns the same name and value every time it connects to the same site.
Typical Uses of Cookies
- Avoiding username and password "Remember me on this computer"
- Personalization
Setting a Cookie
- Setting a cookie in PHP is a simple matter using the setcookie function.
- The setcookie function has parameters:
- name: the name of the cookie
- value: the value of the cookie
- expire: (optional) the Unix timestamp of the expiration date
- path: (optional) the path of the cookie on the server
- domain: (optional) the internet domain of the cookie
- secure: (optional) whether the cookie must use a secure connection
Example of Setting a Cookie
- An example of setting a cookie is:
setcookie('location', 'USA', time() + 60 * 60 * 24 * 7, '/');
Accessing a Cookie
- Reading the value of a cookie is as simple as accessing the
$_COOKIEsystem array. - Note that you can read a cookie back only after it has been sent to a web browser.
Destroying a Cookie
- To delete a cookie, you must issue it again and set a date in the past.
- It is important for all parameters in the new setcookie call, except the timestamp, to be identical to the parameters when the cookie was first issued.
Expiring Cookies
- By default, a cookie expires automatically when the browser exits.
- You can set the expiration of a cookie to a specific time in the future or past.
Example of Cookies
- An example of creating a cookie that stores the user's last visit to measure how often people return to visit a webpage.
- The cookie's expiration date is set to two months in the future.
Persistence
- Persistence is the ability of data to outlive the execution of the program that created them.
Persistence and HTTP
- HTTP is a stateless protocol, which means it remembers nothing about previous transfers.
- Two ways to achieve persistence are:
- PHP cookies
- PHP sessions
Cookies
- A cookie is an item of data that a web server saves to a user's computer's hard disk via a web browser.
- Cookies can contain almost any alphanumeric information (as long as it's under 4 KB) and can be retrieved from the user's computer and returned to the server.
- Common uses of cookies include session tracking, maintaining data across multiple visits, holding shopping cart contents, and storing login details.
Using Cookies in PHP
- Script sends a simple name and value to the client, which saves it in the file system.
- The client returns the same name and value every time it connects to the same site.
Typical Uses of Cookies
- Avoiding username and password "Remember me on this computer"
- Personalization
Setting a Cookie
- Setting a cookie in PHP is a simple matter using the setcookie function.
- The setcookie function has parameters:
- name: the name of the cookie
- value: the value of the cookie
- expire: (optional) the Unix timestamp of the expiration date
- path: (optional) the path of the cookie on the server
- domain: (optional) the internet domain of the cookie
- secure: (optional) whether the cookie must use a secure connection
Example of Setting a Cookie
- An example of setting a cookie is:
setcookie('location', 'USA', time() + 60 * 60 * 24 * 7, '/');
Accessing a Cookie
- Reading the value of a cookie is as simple as accessing the
$_COOKIEsystem array. - Note that you can read a cookie back only after it has been sent to a web browser.
Destroying a Cookie
- To delete a cookie, you must issue it again and set a date in the past.
- It is important for all parameters in the new setcookie call, except the timestamp, to be identical to the parameters when the cookie was first issued.
Expiring Cookies
- By default, a cookie expires automatically when the browser exits.
- You can set the expiration of a cookie to a specific time in the future or past.
Example of Cookies
- An example of creating a cookie that stores the user's last visit to measure how often people return to visit a webpage.
- The cookie's expiration date is set to two months in the future.
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Description
Learn about the importance of persistence in web development, including counting website hits and storing client information using cookies and sessions.
