How can PHP developers ensure data integrity and security when allowing users to preview their input before submission in a web application?

To ensure data integrity and security when allowing users to preview their input before submission in a web application, PHP developers can sanitize and validate the input before displaying it back to the user. This involves removing any potentially harmful characters or scripts and ensuring that the input meets the required format. Additionally, developers can use secure coding practices such as parameterized queries to prevent SQL injection attacks. 

// Sanitize and validate user input before displaying it back to the user
$user_input = $_POST['user_input'];
$sanitized_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Display the sanitized input to the user for preview
echo "Preview: " . $sanitized_input;

Keywords

data validation input sanitization cross-site scripting SQL injection prepared statements

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