Examples of how cookies are used in PHP _php

1. Create/Update cookies
Copy CodeThe code is as follows:
Setcookie ($cookieName, $value, time () + number of seconds);

Example: Create a cookie with a name of username and a value of ZS with an expiration time of 2 weeks
Copy the Code code as follows:
Setcookie ("UserName", "Zs", Time () +2*7*24*3600);

If you do not set the time, it is not saved to the cookie file. can be accessed when the browser is not closed. When the browser is closed, it cannot be accessed.

Example:
Copy the Code code as follows:
Setcookie ("Age", "18");

2. Take the value of the cookie
Copy the Code code as follows:
$_cookie[$cookieName];

Example: Remove the value of the username and place it in the variable $uname
Copy the Code code as follows:
$uName =$_cookie[' UserName '];

When a value is taken, it is generally judged whether it is empty, and then the value operation is taken. The above value operation is generally written like this:
Copy the Code code as follows:
if (!empty ($_cookie[' UserName '))
{

$uName =$_cookie[' UserName '];

}

3. Delete the specified cookie
Copy the Code code as follows:
Setcookie ($cookieName, Value,time ()-seconds);
Or
Setcookie ($cookiename, ");
Or
Setcookie ($cookiename, NULL);

Example: Delete username
Copy the Code code as follows:
Setcookie ("UserName", "Zs", Time ()-3600);

4. Delete all cookies for the current session
Copy the Code code as follows:
foreach ($_cookie as $key = = $val) {
Setcookie ($key, "", Time ()-100);
}

When there is no cookie, the file that saves the cookie is also deleted.

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