Is it better to sanitize user input in JavaScript/Ajax or in PHP scripts for PHP applications?

It is generally better to sanitize user input in PHP scripts for PHP applications because PHP is server-side and can validate and sanitize data before it reaches the database or any other critical parts of the application. This helps prevent security vulnerabilities and ensures that only clean data is processed by the application. 

// Example PHP code snippet for sanitizing user input in PHP scripts
$userInput = $_POST['user_input'];
$cleanInput = filter_var($userInput, FILTER_SANITIZE_STRING);
// Use $cleanInput in your application to prevent SQL injection or other security issues

Keywords

JavaScript Ajax PHP scripts sanitize user input

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