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)

Parameters	Description
name	required. Specifies the name of the cookie.
value	Required. Specifies the value of the cookie.
expire	Optional. Specifies the validity period of the cookie.
path	optional. Specifies the server path for cookies.
domain	Optional. Specifies the domain name for the cookie.
secure	Optional. Specifies whether cookies are transmitted over a secure HTTPS connection.

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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