In PHP, what are the differences between using $_GET and $_POST to retrieve data from a form submission, and how can these variables be properly utilized in database queries?

When retrieving data from a form submission in PHP, using $_GET retrieves data sent in the URL parameters while $_POST retrieves data sent in the request body. To properly utilize these variables in database queries, you should always sanitize and validate the input data to prevent SQL injection attacks. You can then use the retrieved data in your database queries to insert, update, or fetch information from the database. 

// Retrieving data from a form submission using $_POST
$username = $_POST['username'];
$password = $_POST['password'];

// Sanitize and validate input data
$username = filter_var($username, FILTER_SANITIZE_STRING);
$password = filter_var($password, FILTER_SANITIZE_STRING);

// Use the data in a database query
$query = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
// Execute the query using your database connection

Keywords

$_GET $_POST form submission database queries PHP

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