20     protected $unit;  variable in HTMLPurifier_Length
46         $this->unit = $u !== false ? (string) $u : false;
61         $unit = substr($s, $n_length);
62         if ($unit === '') {
63             $unit = false;
65         return new HTMLPurifier_Length($n, $unit);
78         if ($this->n === '0' && $this->unit === false) {
81         if ($this->unit === false || !ctype_lower($this->unit)) {
82             $this->unit = strtolower($this->unit);
84         if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) {
106         return $this->n . $this->unit;
124         return $this->unit;
151         if ($l->unit !== $this->unit) {
153             $l = $converter->convert($l, $this->unit);