What are the recommended methods for securely displaying user input in form fields using PHP?

When displaying user input in form fields using PHP, it is important to prevent any potential security vulnerabilities such as cross-site scripting (XSS) attacks. To securely display user input, you can use the htmlentities function in PHP to convert any potentially harmful characters into their HTML entities, which will prevent them from being interpreted as code by the browser. 

<?php
$user_input = $_POST['user_input']; // Assuming user input is received via POST method

// Display the user input securely in a form field
echo '<input type="text" name="user_input" value="' . htmlentities($user_input) . '">';
?>

Keywords

htmlspecialchars htmlentities filter_var XSS validation

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