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PHP Cookie

2022-07-22 19:36:00 【I can't understand your code】

cookie Often used to identify users .

Cookie What is it? ？

cookie Often used to identify users .cookie It's a small file that the server leaves on the user's computer . Whenever the same computer requests a page through a browser , This computer will send cookie. adopt PHP, You can create and retrieve cookie Value .

How to create Cookie？

setcookie() Function to set cookie.

notes ：setcookie() Function must be in Before the label .

grammar

setcookie(name, value, expire, path, domain);

example 1

In the following example , We're going to create something called "user" Of cookie, And assign it a value "runoob". We also stipulate this cookie Expire in an hour ：

<?php
setcookie("user", "runoob", time()+3600);
?>

<html>
.....

notes ： Sending cookie when ,cookie The value of will be automatically URL code , Automatically decode when retrieving .（ To prevent URL code , Please use setrawcookie() Instead, .）

example 2

You can also set... In another way cookie The expiration time of . This may be simpler than using seconds .

<?php
$expire=time()+60*60*24*30;
setcookie("user", "runoob", $expire);
?>

<html>
.....

In the example above , The expiration time is set to one month （60 second * 60 branch * 24 Hours * 30 God ）.

How to retrieve Cookie Value ？

PHP Of $_COOKIE Variables are used to retrieve cookie Value .

In the following example , We got back the name "user" Of cookie Value , And show it on the page ：

<?php
//  Output  cookie  value 
echo $_COOKIE["user"];

//  View all  cookie
print_r($_COOKIE);
?>

In the following example , We use isset() Function to confirm whether cookie：

<html>
<head>
<meta charset="utf-8">
<title> Novice tutorial (runoob.com)</title>
</head>
<body>

<?php
if (isset($_COOKIE["user"]))
    echo " welcome  " . $_COOKIE["user"] . "!<br>";
else
    echo " Ordinary visitors !<br>";
?>

</body>
</html>

How to delete Cookie？

When the delete cookie when , You should change the expiration date to a point in the past .

Deleted instance ：

<?php
//  Set up  cookie  Expire in the past  1  Hours 
setcookie("user", "", time()-3600);
?>

If the browser does not support Cookie What should I do ？

If your application needs and does not support cookie Dealing with your browser , Then you have to use other methods to pass information between pages in your application . One way is to pass data through a form （ About forms and user input , We've covered... In the previous chapters of this tutorial ）.

The following form click on the user list "Submit" Button , towards "welcome.php" Submitted user input ：

<html>
<head>
<meta charset="utf-8">
<title> Novice tutorial (runoob.com)</title>
</head>
<body>

<form action="welcome.php" method="post">
 name : <input type="text" name="name">
 Age : <input type="text" name="age">
<input type="submit">
</form>

</body>
</html>

Retrieve "welcome.php" Value in file , As shown below ：

<html>
<head>
<meta charset="utf-8">
<title> Novice tutorial (runoob.com)</title>
</head>
<body>

 welcome  <?php echo $_POST["name"]; ?>.<br>
 you  <?php echo $_POST["age"]; ?>  Year old .

</body>
</html>

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