What are common pitfalls when using MySQL queries in PHP, as seen in this forum thread?

Common pitfalls when using MySQL queries in PHP include not properly sanitizing user input, not handling errors effectively, and not using prepared statements to prevent SQL injection attacks. To solve these issues, always sanitize user input using functions like mysqli_real_escape_string(), handle errors with try-catch blocks, and use prepared statements with placeholders to safely execute queries. 

// Example of using prepared statements to prevent SQL injection

// Assuming $conn is a valid mysqli connection

$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

$username = mysqli_real_escape_string($conn, $_POST['username']); // Sanitize user input
$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Process the fetched data
}

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

Keywords

MySQL queries PHP SQL injection error handling prepared statements

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