What are the potential pitfalls of using single quotes instead of backticks in SQL queries when using PDO in PHP?

Using single quotes instead of backticks in SQL queries when using PDO in PHP can lead to syntax errors or unexpected behavior, especially when dealing with table or column names that contain reserved keywords or special characters. To avoid these pitfalls, it is recommended to always use backticks to enclose table and column names in SQL queries.

// Incorrect usage of single quotes
$stmt = $pdo->query("SELECT * FROM 'users' WHERE 'id' = 1");

// Correct usage of backticks
$stmt = $pdo->query("SELECT * FROM `users` WHERE `id` = 1");