20     public $lookup = array();  variable in HTMLPurifier_ContentSets
48                 if (isset($this->lookup[$key])) {
50                     $this->lookup[$key] = array_merge($this->lookup[$key], $temp);
52                     $this->lookup[$key] = $temp;
57         while ($old_lookup !== $this->lookup) {
58             $old_lookup = $this->lookup;
59             foreach ($this->lookup as $i => $set) {
62                     if (isset($this->lookup[$element])) {
63                         $add += $this->lookup[$element];
64                         unset($this->lookup[$i][$element]);
67                 $this->lookup[$i] += $add;
71         foreach ($this->lookup as $key => $lookup) {
72             $this->info[$key] = implode(' | ', array_keys($lookup));