What best practices should PHP developers follow to prevent SQL syntax errors in their code?

To prevent SQL syntax errors in PHP code, developers should use prepared statements with parameterized queries instead of directly inserting variables into SQL queries. This helps to prevent SQL injection attacks and ensures that the SQL syntax is correct regardless of the input values.

// Example of using prepared statements to prevent SQL syntax errors
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();
$results = $stmt->fetchAll();