php jump to other web pages

In website development, it is often necessary to automatically jump to another page after the user completes an operation. In PHP, we can use the header() function to achieve this functionality.

1. header() function

header() function is used to send raw HTTP headers to the client, usually used for redirects or setting cookies. The syntax is as follows:

header(string $header_string [, bool $replace = true [, int $http_response_code ]]): void
//Among them, $header_string is the HTTP header information to be sent, $ replace indicates whether to replace the header with the same name, and $http_response_code indicates the returned HTTP status code.

2. Redirect

Redirect means that when a user accesses a page, the server returns a 3XX status code, telling the browser to redirect the request to another page. superior. You can use the header() function in PHP to implement redirection. The code is as follows:

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

In this example, we specify the redirect target address by setting the Location header. Note that nothing should be output before calling the header() function, otherwise an error will be reported. If you need to output something before redirecting, you can use the ob_start() function to cache the output.

3. Redirect with parameters

Sometimes we need to pass some parameters to the redirected page for subsequent processing. At this time, you can append the parameters to the end of the URL, for example:

header("Location: http://www.example.com/?name=Tom&age=20");
?>

In the redirected page, you can use the $_GET super global variable to obtain the passed parameters, for example:

$name = $ _GET['name'];
$age = $_GET['age'];
?>

4. Redirect with delay

Sometimes we need to add some delay before jumping to give the user enough time to see something. You can use the sleep() function in PHP to achieve this function, for example:

sleep(5);
header("Location: http://www.example.com /");
?>

In this example, we use the sleep() function to pause execution for 5 seconds before jumping to the target page.

Summary

The header() function in PHP can easily implement page redirection, and can also take parameters and delays. You should pay attention to comply with the HTTP protocol when using it to avoid some security issues.

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