18     protected $preserve = array();  variable in HTMLPurifier_PercentEncoder
22      * @param bool $preserve
24     public function __construct($preserve = false)  argument
28             $this->preserve[$i] = true;
31             $this->preserve[$i] = true;
34             $this->preserve[$i] = true;
36         $this->preserve[45] = true; // Dash         -
37         $this->preserve[46] = true; // Period       .
38         $this->preserve[95] = true; // Underscore   _
39         $this->preserve[126]= true; // Tilde        ~
42         if ($preserve !== false) {
43             for ($i = 0, $c = strlen($preserve); $i < $c; $i++) {
44                 $this->preserve[ord($preserve[$i])] = true;
63             if ($string[$i] !== '%' && !isset($this->preserve[$int = ord($string[$i])])) {
100             if (isset($this->preserve[$int])) {