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How PHP gets cookies

Source: Internet
Author: User
Tags send cookies setcookie
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PHP Cookies

Cookies are often used to identify users. A cookie is a small file that the server leaves on the user's computer. This computer will send cookies whenever the same computer requests a page through a browser. With PHP, you can create and retrieve the value of a cookie.

How do I create cookies?

The Setcookie () function is used to set cookies. Note: the Setcookie () function must precede the
  1. <?php
  2. Setcookie ("User", "Alexporter", Time () +3600);
  3. ?>
  6. .....

Note: When a cookie is sent, the value of the cookie is automatically encoded and automatically decoded when it is retrieved. (To prevent URL encoding, use Setrawcookie () instead.) ）

How do I get back the value of a Cookie?

PHP's $_cookie variable is used to retrieve the COOKIE's value. In the following example, we retrieve the value of the cookie named "User" and display it on the page:
  1. <?php
  2. Printacookie
  3. echo$_cookie["User"];
  5. Awaytoviewallcookies
  6. Print_r ($_cookie);
  7. ?>
In the following example, we use the Isset () function to confirm that a cookie has been set:
  2. <body>
  4. <?php
  5. if (Isset ($_cookie["user"))
  6. echo "Welcome". $_cookie["user". "! <br> ";
  7. Else
  8. echo "Welcomeguest!<br>";
  9. ?>
  11. </body>


How do I delete cookies?

When you delete a cookie, you should change the expiration date to a past point in time. Deleted instances:
  1. <?php
  2. Settheexpirationdatetoonehourago
  3. Setcookie ("User", "", Time ()-3600);
  4. ?>

How JavaScript creates, acquires cookies


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Related Keywords:
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