How to Retrieve a Username from a MySQL Database Using PHP Given a User ID?

Retrieving an Unknown Username from an ID Using MySQL and PHP

Given a unique ID, the task is to retrieve the associated username from a database using MySQL and PHP. The username should be stored in the $_SESSION['name'] variable.

Steps to Perform the Query:

1. Create the MySQL Query:

   SELECT username FROM user_data WHERE id = ?

   where ? is a placeholder for the ID.

2. Prepare the Query:

   $stmt = $conn->prepare("SELECT username FROM user_data WHERE>

3. Bind the ID Variable:

   $stmt->bind_param("s", $id);

   where s indicates the data type as a string.

4. Execute the Query:

   $stmt->execute();

5. Get the Result:

   $result = $stmt->get_result();

6. Fetch the Data:

   $user = $result->fetch_assoc();

7. Store the Username in the Session Variable:

   $_SESSION['name'] = $user['username'];

Example Code:

<?php
$conn = mysqli_connect('localhost', 'root', '', 'user_data');
$id = '10527391670258314752';

$sql = "SELECT username FROM user_data WHERE>

The above is the detailed content of How to Retrieve a Username from a MySQL Database Using PHP Given a User ID?. For more information, please follow other related articles on the PHP Chinese website!