A cookie in PHP is a small file with a maximum size of 4KB that the web server stores on the client computer. They are typically used to keep track of information such as a username that the site can retrieve to personalize the page when the user visits the website next time.
A cookie can only be read from the domain that it has been issued from.
Setting Cookie In PHP
To set a cookie in PHP, the setcookie() function is used.
The setcookie() function needs to be called prior to any output generated by the script otherwise the cookie will not be set.
Parameters - The setcookie() function requires six arguments in general which are:
Name - It is used to set the name of the cookie
Value - It is used to set the value of the cookie.
Expire - It is used to set the expiry timestamp of the cookie after which the cookie can’t be accessed.
Path - It is used to specify the path on the server for which the cookie will be available.
Domain - It is used to specify the domain for which the cookie is available.
Security - It is used to indicate that the cookie should be sent only if a secure HTTPS connection exists
Creating a cookie named User_Name and assigning the value Wikitechy to it.
The cookie will expire after 5 days(5 days * 24 hours * 30 mins * 60 seconds).
Checking Whether a Cookie Is Set Or Not
It is always advisable to check whether a cookie is set or not before accessing its value.
Therefore to check whether a cookie is set or not, the PHP isset() function is used.
To check whether a cookie “User_Name” is set or not, the isset() function is executed as follows:
Accessing Cookie Values
For accessing a cookie value, the PHP $_COOKIE superglobal variable is used.
It is an associative array that contains a record of all the cookies values sent by the browser in the current request. The records are stored as a list where the cookie name is used as the key.
To access a cookie named “User_Name”, the following code can be executed.
The setcookie() function can be used to delete a cookie.
For deleting a cookie, the setcookie() function is called by passing the cookie name and other arguments or empty strings but however this time, the expiration date is required to be set in the past.
To delete a cookie named “User_Name”, the following code can be executed.
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