PHP setcookie usage

Definition and usage

The setcookie() function sends an HTTP cookie to the client.

A cookie is a variable sent by the server to the browser. Cookies are typically small text files that a server embeds on a user's computer. This cookie is sent each time the computer requests a page through the browser.

The name of the cookie is specified as a variable of the same name. For example, if the cookie being sent is named "name", a variable named $user is automatically created containing the cookie's value.

There cannot be any losses before assigning a value to the cookie. The function returns true if successful, false otherwise.

Note: Cookie settings must be refreshed before they can take effect.

Syntax

1. setcookie(name,value,expire,path,domain,secure)

Tips and Notes

Note: The value of the cookie named "user" can be accessed through $HTTP_COOKIE_VARS["user"] or $_COOKIE["user"].

Note: When sending a cookie, the cookie value is automatically URL encoded. URL decoding is done on reception. If you don't need this, you can use setrawcookie() instead.

Example 1

Set and send cookie:

<?php

$value ="my cookie value";

// 发送一个简单的 cookie

setcookie("TestCookie",$value);

?>

<?php

$value ="my cookie value";

// 发送一个 24 小时候过期的 cookie

setcookie("TestCookie",$value, time()+3600*24);

?>

Example 2

Different ways to retrieve cookie value:

// 输出个别的 cookie

echo $_COOKIE["TestCookie"];

echo "
";

echo $HTTP_COOKIE_VARS["TestCookie"];

echo "
";

// 输出所有 cookie

print_r($_COOKIE);

?>

Output:

my cookie value
my cookie value
Array([TestCookie]=>my cookie value)

Example 3

Passed Set the expiration date to a date/time in the past, delete a cookie:

<?php
// 把失效日期设置为一小时前
setcookie ("TestCookie","", time()-3600);
?>

Example 4

Create an array of cookies:

<?php
setcookie("cookie[three]","cookiethree");
setcookie("cookie[two]","cookietwo");
setcookie("cookie[one]","cookieone");
// 输出 cookie （在重载页面后）
if(isset($_COOKIE["cookie"])){
foreach($_COOKIE["cookie"]as $name => $value){
echo "$name : $value 
";
}
}
?>

Output:

three : cookiethree
two : cookietwo
one : cookieone

Example 5

About setting cookies The problem does not take effect after. Usually the reason is that the scope is not set

<?php
setcookie("a","bb",time()+3600,"/",".hi-docs.com");
// 注意把域名设置为自己的
?>

The above introduces the usage of PHP setcookie, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.

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