How to use header() function in php to jump to web page

PHP is a commonly used server-side scripting language. Its function is to generate dynamic web content. In websites, we often need to jump users, such as jumping to the homepage after successful login, or jumping to a specified page. In PHP, you can use the header() function to jump to web pages.

Header() function usage

The header() function is a function in PHP used to process HTTP header information. It can send HTTP header information to the client. This enables functions such as jumps. Its usage is as follows:

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

Among them, the $string parameter is required. It represents the HTTP header information to be sent, which can be a single string or a key-value pair. For example, to redirect the user to http://www.example.com, you can use the following code:

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

This statement will set the Location field in the HTTP header information to http://www .example.com to achieve the jump.

It should be noted that if the header() function is not called before actual output (such as echo), then it will take effect. That is, if there is any output before the header() function, the function will fail and return a warning.

Example

The following is a simple example that demonstrates how to implement web page jump in PHP. Suppose there is a login.php page. When the user enters the correct username and password, it jumps to the welcome.php page.

login.php page code is as follows:

<?php // 验证用户名和密码，如果正确则跳转到welcome.php
$username = $_POST["username"];
$password = $_POST["password"];

if ($username == "admin" && $password == "123456") {
    header("Location: welcome.php");
} else {
    echo "用户名或密码错误！";
}
?>

    用户名：
    密码：
    

welcome.php page code is as follows:

<?php echo "欢迎访问本站！";
?>

When the user enters the correct user name and password on the login.php page, It will jump to the welcome.php page and output the prompt message "Welcome to this site!"

Summary

You can use the header() function to implement web page jump in PHP. This function can set the Location field in the HTTP header information to implement the jump. It should be noted that there cannot be any actual output before the header() function, otherwise the function will fail and return a warning.

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