What are the potential risks of allowing HTML in form input and how can they be mitigated in PHP?

Allowing HTML in form input can lead to security vulnerabilities such as cross-site scripting (XSS) attacks, where malicious scripts are injected into the page. To mitigate this risk in PHP, you can use the `htmlspecialchars()` function to encode any HTML characters entered in the form input. 

// Mitigate XSS risk by encoding HTML characters in form input
$input = $_POST['input'];
$encoded_input = htmlspecialchars($input);

// Now $encoded_input can be safely used in your application

Keywords

HTML injection cross-site scripting (XSS) htmlspecialchars htmlentities input validation

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