What are the recommended security measures for filtering and sanitizing user input in PHP scripts?

When working with user input in PHP scripts, it is essential to filter and sanitize the data to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. To achieve this, you can use functions like filter_input() and htmlspecialchars() to validate and sanitize user input before using it in your application. 

// Example of filtering and sanitizing user input in PHP
$input = $_POST['user_input']; // Assuming user input is submitted via POST method

// Filter the input to ensure it is an integer
$filtered_input = filter_input(INPUT_POST, 'user_input', FILTER_VALIDATE_INT);

// Sanitize the input to prevent XSS attacks
$sanitized_input = htmlspecialchars($filtered_input, ENT_QUOTES, 'UTF-8');

Keywords

filter_input htmlspecialchars prepared statements validation cross-site scripting

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