What potential security risks are associated with not validating user input in PHP?

Not validating user input in PHP can lead to security risks such as SQL injection, cross-site scripting (XSS), and other malicious attacks. To mitigate these risks, it is essential to validate and sanitize user input before using it in your application. 

// Example of validating user input in PHP
$userInput = $_POST['user_input'];

// Validate and sanitize user input
$validatedInput = filter_var($userInput, FILTER_SANITIZE_STRING);

// Now you can safely use $validatedInput in your application

Keywords

SQL injection cross-site scripting remote code execution input validation PHP filter_input.

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