How can PHP developers ensure that online database entries are properly validated and sanitized to prevent security vulnerabilities?

To ensure that online database entries are properly validated and sanitized in PHP, developers should use prepared statements with parameterized queries to prevent SQL injection attacks. Additionally, input data should be validated against expected formats and sanitized to remove any potentially harmful characters before being inserted into the database. 

// Example of validating and sanitizing user input before inserting into a database using prepared statements

// Assuming $conn is the database connection object

// Validate and sanitize user input
$name = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Prepare SQL statement with placeholders
$stmt = $conn->prepare("INSERT INTO users (name, email) VALUES (?, ?)");

// Bind parameters to placeholders and execute the statement
$stmt->bind_param("ss", $name, $email);
$stmt->execute();

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

Keywords

SQL injection prepared statements input validation data sanitization security vulnerabilities

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