How PHP uses the GET method to jump to pages and transfer values

In PHP development, sometimes we need to jump between pages and pass some data. Among them, using the GET method to pass values ​​is a more common way. In this article, we will introduce how to use the GET method to jump to pages and pass values ​​in PHP.

1. Use hyperlinks to jump

We can use hyperlinks (that is, tags) in HTML to jump to pages. At the same time, value transfer can be achieved by adding data parameters to the link. For example:

<a href="next_page.php?name=John&age=23">跳转到下一页</a>

Among them, next_page.php is the file name of the target page, and name=John&age=23 after the question mark is the data parameter. On the next page, we can get this data through the $_GET array:

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

2. Use the header() function to jump

In addition to using hyperlinks, We can also use the header() function to implement page jumps. For example:

<?php
$name = &#39;John&#39;;
$age = 23;
header(&#39;Location: next_page.php?name=&#39; . $name . &#39;&age=&#39; . $age);
?>

Among them, the header() function can send an HTTP header to the browser, which instructs the browser to redirect the page to the specified URL. By adding data parameters after the URL, we can achieve data transfer. Same as using hyperlinks, we can get this data through the $_GET array on the next page.

It should be noted that when using the header() function, this function must be called before any output, otherwise an error will occur.

3. Use form submission to pass value

In addition to the above two methods, we can also use form submission to pass value. For example: In the

<form action="next_page.php" method="get">
    <input type="text" name="name" placeholder="姓名">
    <input type="text" name="age" placeholder="年龄">
    <button type="submit">提交</button>
</form>

form, we specify to submit to the next_page.php page and use the GET method to pass the value. On the next page, we can get this data through the $_GET array.

It should be noted that when using form submission, the submission action is triggered by a button, not a hyperlink. At the same time, we need to define the input elements in the form, such as text boxes, drop-down boxes, etc., through the <input> tag.

Summary

The above three methods can realize page jump and value transfer in PHP. Using hyperlinks and the header() function is usually used for operations between pages, while using form submission is often used for submission operations after the user enters data. It is necessary to choose the appropriate method according to the actual situation.

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