Database value three-level classification background traversal

/**
*Converts a one-dimensional array of labels read from a database into a tag tree form
 *Depending on the value of eachPARENT_ID,Leaves that change to the corresponding value
 *@paramsArray $tagListOne-dimensional array read from the database,Each value of the array containsIdAndparent_id
* int $rootThe parent of the root nodeID string $idDefault isIdColumn NameString $pidDefault isparent_idColumn NameString $childIndex of Branch Point
 *@returnArray $treeA label tree for multidimensional arrays
 * */
static functionGetdictionarytree ($tagList,$root =0,$id =' ID ',$pid =' ParentID ',$child =' Child ') {
 $tagTree =Array ();//Tree
 if (Is_array ($tagList)) {
 $array =Array ();
 foreach ($tagListAs$key =$item) {
 $array [$item [$id]] = &$tagList [$key];//Extracts the address of each element in the array in memory
}

 foreach$tagListAs$key =$item) {
 $parentId =$item [$pid];
 If$root = =$PARENTID) {
 $tagTree [] = &$tagList [$key];
}else{
 IfIsset$array [$PARENTID])) {
 $parent = &$array [$PARENTID];//Find the parent directlyIdIn-memory address,Then add child nodes
 $parent [' node '] =True;NodeForTrueIndicates that there are child nodes under it,Convenient front desk Display this item can be expanded
 $parent [$child [] = &$tagList [$key];
}
}
}
}
 Return$tagTree;
}

/**
  multidimensional array to one-dimensional array, To delete a label, delete the parent tag, all the child tag IDs get the 
 * @params array $tree The information read from the database bool $getTagName returns the label name, FALSE only returns the label ID 
 * BOOL $getGr Ouptag whether to return the Child Group label (valid only when the label name is returned) array $ret the initial value of the recursive call 
 * @return Array $ret The list of IDs returned, or Id=>array (' TagName ' =>name, ' ta GType ' =>val ' array list, Tattype 0 for normal tag 1 for group Tag * */
 
 static function Array_multi_to_single ($tree, $getTagName = Fals　　　　　　E, $getGroupTag = true, $ret = Array ()) 
 {
 foreach ($tree as $k + $v) {
 if (!empty ($v [' child ')]) {
 $ret = Self::array_multi_to_single ($v [' Child '], $getTagName, $getGroupTag, $ret); 
} 
 if ($getTagName) {
 if (isset ($v [' Child '])} {
 if ($getGroupTag) {
 $ret [$v [' id ']] = $v [' name ']; 
} 
}else{
 $ret [$v [' id ']] = $v [' name '];　　 
} 
}else{
 Array_push ($ret, $v [' id ']); 
 } 
} 
 return  < Span style= "color: #cc7832;" >< Span style= "color: #9876aa;" >< Span style= "color: #629755; Font-style:italic; " > $ret;}   

Database value three-level classification background traversal