A cookie in PHP is a small file that holds data up to 4 KB. Cookies are stored on the client computer.
The syntax for set cookie() is as follows:
set cookie (name, value, expire, path, domain, secure, HTTP only);
- name: The name of the cookie.
- value: The value to be stored in the cookie.
- expire: The expiration time (in seconds from the current time).
- path: The path within the domain where the cookie will be available.
- domain: The domain for which the cookie is available.
- secure: If true, the cookie will only be sent over secure HTTPS connections.
- HTTP only: If true, the cookie will be accessible only through the HTTP protocol (inaccessible via JavaScript).
Follow the steps below to create and use Cookies in PHP
Set a Cookie in PHP :
To set a cookie, we use the setCookie () function. This function must be called before any HTML output on the page. It accepts four parameters (name, value, expire, path).
Example: In this example, we create a cookie named username
<?php
// Set a cookie named "username" with a value of "JohnDoe" that expires in 1 hour
setcookie("username", "Deepak", time() + 3600, "/");
echo "Cookie has been set!";
?>
<?php
// Set a cookie named "username" with a value of "JohnDoe" that expires in 1 hour
setcookie("username", "Deepak", time() + 3600, "/");
echo "Cookie has been set!";
?>
<?php
// Set a cookie named "username" with a value of "JohnDoe" that expires in 1 hour
setcookie("username", "Deepak", time() + 3600, "/");
echo "Cookie has been set!";
?>In this example:
- “username” is the cookie name.
- “Deepak” is the value assigned to the cookie.
- time() + 3600 sets the cookie to expire in one hour (3600 seconds from the current time).
- The “/” specifies that the cookie is available throughout the entire website.
Accessing Cookies in PHP
To access cookies, we use $_COOKIE super global array
<?php
if(isset($_COOKIE["username"])) {
echo "Welcome " . $_COOKIE["username"];
} else {
echo "Cookie 'username' is not set.";
}
?>
<?php
if(isset($_COOKIE["username"])) {
echo "Welcome " . $_COOKIE["username"];
} else {
echo "Cookie 'username' is not set.";
}
?>
<?php
if(isset($_COOKIE["username"])) {
echo "Welcome " . $_COOKIE["username"];
} else {
echo "Cookie 'username' is not set.";
}
?>In the above example, we use isset to check if the cookie exists or not.
Deleting a Cookie
To delete a cookie, set the cookie’s expiration time to a time
<?php
// Set the expiration time to one hour ago
setcookie("username", "", time() - 3600, "/");
echo "Cookie 'username' has been deleted!";
?>
<?php
// Set the expiration time to one hour ago
setcookie("username", "", time() - 3600, "/");
echo "Cookie 'username' has been deleted!";
?>
<?php
// Set the expiration time to one hour ago
setcookie("username", "", time() - 3600, "/");
echo "Cookie 'username' has been deleted!";
?>Read Also:
Understanding the_content Filter Hook in WordPress: Customizing Post Content
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