What are some potential security risks associated with directly using user input in PHP scripts?

Using user input directly in PHP scripts can lead to security risks such as SQL injection, cross-site scripting (XSS), and code injection. To mitigate these risks, it is important to sanitize and validate user input before using it in the script. This can be done by using functions like htmlspecialchars() to prevent XSS attacks, prepared statements to prevent SQL injection, and regular expressions to validate input. 

// Example of sanitizing user input using htmlspecialchars()
$userInput = $_POST['user_input'];
$sanitizedInput = htmlspecialchars($userInput);
echo $sanitizedInput;

Keywords

SQL injection cross-site scripting input validation output encoding prepared statements

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