Why Does My PHP Script Insert Data Twice into the Database?

PHP Inserts Data Twice on Database

Issue:

A PHP script inserts data into a MySQL database twice after running once. When the script runs twice due to a page refresh, only one result appears in the database.

Cause:

This behavior can occur when multiple requests are made to the script, such as when a user refreshes the page. This issue is particularly evident when using Opera or Chrome browsers.

Reason:

Typically, browsers request a script and a favicon when accessing a website. When this occurs, the PHP script responsible for inserting data into the database may execute twice.

Solution:

To resolve this issue, implement a mechanism that ensures the insert query only executes for specific requests. For example, a common approach is to use the following code:

if ($_SERVER['REQUEST_URI'] == '/specific/request') {
    // Insert query here
}

This checks if the request URI is a specific one before executing the insert query, preventing duplicate insertions.

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