Home > Article > Backend Development > 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
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:
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:
Example 4
Create an array of cookies:
$value){ echo "$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
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.
Related articles:
If setcookie does not set the expiration time, how should I write the set path?
php setcookie function invalid
cookies setting PHP setcookie setting Cookie usage and setting invalid problem