What are the risks associated with using JavaScript for immediate data manipulation in PHP?

When using JavaScript for immediate data manipulation in PHP, the main risk is that the client-side JavaScript code can be manipulated by the user, leading to potential security vulnerabilities or data inconsistencies. To mitigate this risk, it is recommended to validate and sanitize user input on the server-side (PHP) before processing it with JavaScript. 

// Server-side validation and sanitization example
$user_input = $_POST['user_input'];

// Validate and sanitize user input
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Process the sanitized input
// Perform data manipulation with PHP

Keywords

JavaScript data manipulation PHP security risks cross-site scripting

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