How can PHP developers ensure proper encoding and escaping of HTML characters in their code to prevent security vulnerabilities?

PHP developers can ensure proper encoding and escaping of HTML characters in their code by using functions like htmlspecialchars() or htmlentities() to encode user input before displaying it on a webpage. This prevents potential security vulnerabilities such as cross-site scripting (XSS) attacks where malicious scripts can be injected into the page. By encoding user input, developers can ensure that any special characters are displayed as plain text rather than interpreted as HTML code. 

$user_input = "<script>alert('XSS attack');</script>";
$encoded_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');
echo $encoded_input;

Keywords

htmlspecialchars htmlentities XSS security vulnerabilities encoding

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