How can PHP developers avoid displaying incorrect data from a database query, such as in the case of id2 showing the vorname from id1?

To avoid displaying incorrect data from a database query, PHP developers should ensure that they are fetching and displaying data based on the correct unique identifier, such as the primary key. This can be achieved by using the WHERE clause in the SQL query to filter results based on the specific identifier being used. Additionally, developers should validate and sanitize user input to prevent SQL injection attacks that could lead to displaying incorrect data. 

<?php
// Assuming $id is the unique identifier being used
$id = $_GET['id'];

// Query to fetch data based on the correct unique identifier
$query = "SELECT * FROM table_name WHERE id = :id";
$stmt = $pdo->prepare($query);
$stmt->bindParam(':id', $id);
$stmt->execute();

// Fetch and display the data
$row = $stmt->fetch(PDO::FETCH_ASSOC);
echo $row['column_name'];
?>

Keywords

PHP database query SQL injection prepared statements data validation

Related Questions