How can PHP developers ensure that data entered by users, even administrators, is properly validated and sanitized to prevent potential security breaches or data corruption?

To ensure that data entered by users, including administrators, is properly validated and sanitized in PHP, developers can use functions like filter_var() and htmlspecialchars() to filter input data and prevent potential security breaches or data corruption. 

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

// Sanitize output data
echo htmlspecialchars($username);
echo htmlspecialchars($email);

Keywords

PHP data validation data sanitization security breaches data corruption

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