In what ways can PHP be utilized to ensure security when allowing end users to edit content on a website?

When allowing end users to edit content on a website, it is crucial to implement security measures to prevent malicious code injection or unauthorized access. One way to enhance security is by sanitizing user input to remove any potentially harmful code or characters. This can be done using PHP functions like htmlentities() or htmlspecialchars() to encode user input before displaying it on the website.

// Sanitize user input before displaying on the website
$user_input = "<script>alert('XSS attack!');</script>";
$sanitized_input = htmlentities($user_input);

echo $sanitized_input;