php jump URL command

PHP jump URL command (header() function)

When developing a website, it is often necessary to implement the page jump function, and the header() function provided by PHP can realize this function.

The header() function allows us to send HTTP header information to the client browser to control page jumps and other operations.

The syntax of the header() function is as follows:

header("Location: 目标网址");

Among them, the Location parameter is used to specify the target URL that needs to be jumped.

For example, if we want to jump to the Google search page, we can use the following code:

header("Location: https://www.google.com/search?q=php");

Next, let’s look at some common jump usage scenarios.

1. Jump directly to the specified URL

If we want to jump directly to a fixed URL, we can use the following code:

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

Or ：

header("Location: /example.php");

Among them, in the first line of code, we jump to an external URL by specifying the complete URL; and in the second line of code, we jump to the same site by specifying a relative path. of a page.

2. Using redirection

HTTP redirection means that when the browser accesses a page, the server returns an HTTP status code to tell the browser that it needs to jump to another page. page.

In PHP, we can use the header() function to complete this operation. For example:

header("HTTP/1.1 301 Moved Permanently");
header("Location: http://www.example.com/new-page.php");

In this example, we tell the browser that a redirection is needed through HTTP/1.1 301 Moved Permanently, and specify the new page that needs to be jumped to.

3. Delayed jump

In some scenarios, we need to delay the jump, that is, automatically jump to the specified page after a certain period of time. This can be accomplished by setting the Refresh HTTP header.

For example, to implement a jump after a delay of 3 seconds, you can use the following code:

header("Refresh: 3; url=http://www.example.com");

In this example, we specify the refresh page by setting the Refresh parameter and redirect to the specified URL. .

Summary

Using PHP's header() function, we can quickly and easily implement page jumps and other operations.

However, it should be noted that when using the header() function to jump to a page, it must be called before the page outputs any content, otherwise the jump will fail.

In addition, avoid including HTML tags in the parameters of the header() function to avoid jump failure.

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