How to delete data and automatically refresh the page using PHP

In daily web development, adding, deleting, modifying and checking data has become a necessary operation. Although the deletion operation seems simple, user experience issues also need to be considered. When writing web pages in PHP, it is a common requirement to automatically refresh the page after deleting data. This article will introduce how to use PHP to delete data and automatically refresh the page.

1. Deleting data with PHP

Deleting data using PHP can be achieved using SQL statements, the most common of which is the DELETE statement. The DELETE statement is used to delete one or more data records from the database. The basic syntax of this statement is as follows:

DELETE FROM table_name WHERE condition;

Among them, table_name is the name of the table to delete data, and condition is the condition for deleting data.

In actual development, we need to determine the data to be deleted based on specific needs. For example, if you need to delete the data record with id 1, you can use the following SQL statement:

DELETE FROM example_table WHERE id=1;

2. Automatically refresh the page after deletion

How to automatically refresh the page after deleting data using PHP What about refreshing the page? Here are two implementation methods:

1. Use JavaScript’s location.reload() method

The location.reload() method can be used to reload the current page, thereby achieving automatic refresh after deletion The effect of the page. The specific implementation method is as follows:

<?php
//删除数据的代码逻辑
echo "<script>location.reload()</script>"; //使用location.reload()方法刷新页面
?>

You need to pay attention to the following points when using this method:

• This method will reload the entire page, which will cause the filled-in form data to be lost.
• If the data deletion operation is successful, but the page cannot be refreshed normally, it may be due to a browser cache problem. You can try to solve it by adding a random number or timestamp after the JS code.

2. Use the HTTP redirection mechanism

The HTTP redirection mechanism can be used to redirect to the target page after deleting the data. The specific implementation method is as follows:

<?php
//删除数据的代码逻辑
header("Location: http://{$_SERVER[&#39;HTTP_HOST&#39;]}{$_SERVER[&#39;REQUEST_URI&#39;]}"); //使用HTTP重定向机制刷新页面
?>

You need to pay attention to the following points when using this method:

• This method can avoid the problem of data loss caused by page reloading.
• Before using HTTP redirection, you need to ensure that no HTML tags and other content are output, otherwise this method will fail.
• After using this method, you must add the exit() function, otherwise the PHP program will continue to run instead of jumping directly.

3. Summary

This article introduces how to use PHP to delete data and automatically refresh the page after deletion. Using JS's location.reload() method is relatively simple, but it can easily lead to the loss of filled-in form data. The redirection mechanism using HTTP is relatively safe, but you need to pay attention to the output content and adding the exit() function. In actual development, the appropriate implementation method needs to be selected based on specific needs.

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