What are the common pitfalls to watch out for when implementing conditional logic in PHP scripts for database operations?

Common pitfalls to watch out for when implementing conditional logic in PHP scripts for database operations include not properly sanitizing user input, not handling errors effectively, and not using prepared statements to prevent SQL injection attacks. 

// Example of implementing conditional logic with proper error handling and prepared statements

// Assuming $conn is the database connection

$user_id = $_POST['user_id'];

// Use prepared statement to prevent SQL injection
$stmt = $conn->prepare("SELECT * FROM users WHERE user_id = ?");
$stmt->bind_param("i", $user_id);
$stmt->execute();
$result = $stmt->get_result();

if ($result->num_rows > 0) {
    // User exists, perform database operation
    // ...
} else {
    // User does not exist, handle error or return appropriate message
    // ...
}

$stmt->close();
$conn->close();

Keywords

SQL injection error handling prepared statements data validation database transactions

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