How to modify cookie time in php

The setcookie() function can be used to modify the cookie time in php. You only need to set a time value for the third parameter of the function; the syntax format is "setcookie(name, value, expire)", parameters expire specifies the expiration time of the cookie (in the form of a Unix timestamp).

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use setcookie () function to modify the cookie time.

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

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 same computer requests a page through the browser.

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

The cookie must be assigned before any other output is sent to the client.

If successful, this function returns TRUE. Returns FALSE on failure.

The syntax format of the setcookie() function is as follows:

setcookie($name,$value,$expire,$path,$domain,$secure,$httponly)

The parameter description is as follows:

• $name: Set Cookie Name;

• #$value: optional parameter, used to set the cookie value. The value of $value can be obtained in the form of $_COOKIE['$name'];

• $expire: optional parameter, used to set the expiration time of the cookie. This time is Unix Timestamp format. If set to zero or omitted, the cookie will expire at the end of the session (that is, when the browser is closed);

• $path: Optional parameter used to set the cookie to be valid server path. When set to '/', the cookie is valid for the entire domain name $domain. If set to '/foo/', the cookie is only valid for the /foo/ directory and its subdirectories in $domain (such as /foo/bar/). The default value is the directory when setting the cookie;

• $domain: optional parameter, used to set the effective domain name/subdomain name of the cookie. Setting it to a subdomain (for example, 'c.biancheng.net') will make the cookie valid for this subdomain and its third-level domain (for example, php.c.biancheng.net). To make the cookie valid for the entire domain name (including all its subdomains), just set it to the domain name (for example, 'biancheng.net');

• $secure: optional parameter , used to set whether this cookie is only passed to the client through secure HTTPS connections. When set to TRUE, the cookie will only be set when a secure connection exists;

• $httponly: Optional parameter, when set to TRUE, the cookie can only be accessed through the HTTP protocol, that is to say Cookies cannot be accessed through scripting languages ​​like JavaScript. Setting this parameter can effectively reduce the risk of XSS attacks.

Note: If output is generated before calling the setcookie() function, setcookie() will fail and return FALSE. If setcookie() runs successfully, it returns TRUE.

Example:

Use the setcookie() function to create a cookie.

<?php
    setcookie('Website', 'PHP中文网');
    setcookie('Title', 'Cookie', time()+3600);  // 设置 Cookie 1 小时后过期
    setcookie('Url', 'https://www.php.cn/', time()+3600, '/', 'www.php.cn', false);
    echo '<pre>';
    print_r($_COOKIE);
?>

Output:

Array
(
    [Website] => PHP中文网
    [Title] => Cookie
    [Url] => https://www.php.cn/
)

Use the setcookie() function to modify the cookie time to the expiration time---that is, delete the cookie

<?php
    setcookie('Website','');
    setcookie('Title','Cookie',time()-1);
    echo '<pre>';
    print_r($_COOKIE);
?>

The running results are as follows:

Array
(
    [Url] => http://c.biancheng.net/php/
)

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