personal-website/docs/common/utils.php

<?php

/**
 * Object to store info about logged in user
 */
class User
{
	public $user_id;
	public $user_name;
	public $permissions;

	/**
	 * Constructor for the User.
	 */
	public function __construct($userId, $username, $permissions) {
		$this->user_id = $userId;
		$this->user_name = $username;
		$this->permissions = $permissions;
	}
}

/**
 * Sanitize a given input string to be safe to display and process.
 */
function sanitize_input($data) {
	// Remove unnecessary whitespace characters
	$data = trim($data);
	// Remove backslashes
	$data = stripslashes($data);
	// Escape all special characters to HTML entities
	$data = htmlspecialchars($data);
	return $data;
}

?>