What functions can be used to prevent HTML input in PHP forms?

To prevent HTML input in PHP forms, you can use the htmlspecialchars function to convert special characters in the input to HTML entities. This will ensure that any HTML tags entered by the user are displayed as plain text rather than being interpreted as HTML code. By using this function, you can protect your website from potential security vulnerabilities such as cross-site scripting attacks. 

$input = $_POST['input_field'];
$clean_input = htmlspecialchars($input);
// Now $clean_input can be safely used in your application without risking HTML injection

Keywords

htmlspecialchars strip_tags filter_var htmlentities validation

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