What issue did the user encounter with the PHP snippet and how did they seek help?

The issue the user encountered with the PHP snippet was that the code was not properly escaping the user input, leaving it vulnerable to SQL injection attacks. To solve this issue, the user should use prepared statements with parameterized queries to safely interact with the database.

// Fix for SQL injection vulnerability using prepared statements
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// User input
$user_input = $_POST['user_input'];

// Prepare a SQL statement with a placeholder for the user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input to the prepared statement
$stmt->bindParam(':username', $user_input);

// Execute the prepared statement
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

// Process the results
foreach ($results as $row) {
    // Process each row as needed
}