How to jump to a page in PHP and bring cookies

In web development, page jump is a very common operation. In PHP, page jumps can be achieved through the header function. When we need to pass data between two pages, we can use $_COOKIE to set and get cookies.

In this article, we will discuss how to jump pages and bring cookies in PHP to make your web applications more practical.

1. Header function

The header function can send the original HTTP header information to the client, and you can use this function to achieve page jump. Its syntax is as follows:

header(string $string, bool $replace = true, int $http_response_code = 0): bool

where $string is the string of HTTP header information, $replace is a Boolean value, indicating whether to replace the previous header information, and $http_response_code specifies the HTTP response status code.

For example, if we want to jump to the example.com page, we can use the following code:

header("Location: http://example.com");

After this function is executed, the browser will automatically jump to the specified page.

2. Cookie

In the HTTP protocol, state maintenance between the client and the server can be achieved through cookies. In PHP, use the $_COOKIE array to access and set cookies.

To set cookies, you can use the setcookie function. The syntax is as follows:

setcookie(string $name, string $value = "", int $expire = 0, string $path = "", string $domain = "", bool $secure = false, bool $httponly = false): bool

Among them, $name represents the name of the cookie, $value represents the value of the cookie, and $expire represents the expiration time of the cookie ( In seconds), $path indicates the valid path of the cookie, $domain indicates the valid domain name of the cookie, $secure indicates whether it can only be transmitted through HTTPS, and $httponly indicates whether it can only be accessed through the HTTP protocol.

For example, if we want to set a cookie with a name of username, a value of admin, and a validity period of 1 hour, we can use the following code:

setcookie("username", "admin", time( ) 3600);

When we need to obtain cookies, we can use the $_COOKIE array to obtain the corresponding cookie value through the key name.

For example, get the cookie value named username:

$username = $_COOKIE['username'];

3. Page jump with cookie

Sometimes we need to transfer data between two pages, we can use cookies to achieve data transfer. When we set a cookie on the first page and jump to the second page, the second page can obtain the cookie value through the $_COOKIE array.

For example, if we want to pass the user name between two pages, we can set a cookie on the first page and bring the cookie when jumping to the second page.

In the first page, set cookie:

setcookie("username", "admin", time() 3600);

Call in the first page The header function performs page jump:

header("Location: http://example.com/second.php");

In the second page, obtain it through the $_COOKIE array Cookie value:

$username = $_COOKIE['username'];

Through the above operations, we can transfer data between the two pages.

It should be noted that when setting cookies, you need to set them before jumping, otherwise the cookies may not be set when jumping. At the same time, cross-domain and cross-path cookies may be rejected by the browser. Please set the cookie attributes appropriately.

Summary

In PHP, header functions and cookies can very conveniently realize page jumps and data transfer. At the same time, we need to pay attention to the cookie attribute settings to ensure that the cookie can be delivered correctly. In actual development, we need to use it flexibly according to specific situations to improve the practicality and user experience of web applications.

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