How can the security of a PHP script be enhanced by handling errors and queries more securely?

When handling errors and queries in PHP scripts, it is important to sanitize user input to prevent SQL injection attacks and validate input to avoid potential security vulnerabilities. Additionally, using prepared statements with parameterized queries can help protect against SQL injection attacks by separating SQL code from user input. 

// Example of using prepared statements to enhance security when querying a database
// Assume $conn is a valid database connection

// Sanitize user input
$user_input = mysqli_real_escape_string($conn, $_POST['user_input']);

// Prepare a SQL statement using a prepared statement
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $user_input);
$stmt->execute();

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

// Close the statement and connection
$stmt->close();
$conn->close();

Keywords

SQL injection prepared statements error handling secure coding input validation

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