What are some common pitfalls to avoid when using PHP for web development?

One common pitfall to avoid when using PHP for web development is not properly sanitizing user input, which can leave your application vulnerable to security risks such as SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries when interacting with a database to prevent malicious input from being executed as SQL commands. 

// Example of using prepared statements to prevent SQL injection

// Assuming $conn is a valid database connection object
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

// Assuming $username is the user input
$username = $_POST['username'];
$stmt->execute();
$result = $stmt->get_result();

while ($row = $result->fetch_assoc()) {
    // process the retrieved data
}

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

Keywords

SQL injection XSS attacks file inclusion vulnerabilities insecure file uploads unvalidated input.

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