thinkphp List_to_tree for unlimited class listing all nodes

The List_to_tree is easy to use and can be viewed in detail in the manual. Because I need to list all the nodes at the same time, so I wrote a recursive function, for everyone to refer to.

Public Function Index () {    Load (' extend ');            Load extension method    $Category =d (' Category ');    $list = $Category->order (' sort desc ')->select ();//implement Peer node sort    $list =list_to_tree ($list, ' id ', ' fid '); For detailed parameters See manual    $list = $this->findchild ($list);        Dump ($list);} Protected  function Findchild ($arr) {        static $tree =array ();        foreach ($arr as $key = + $val) {                $tree []= $val;                if (Isset ($val [' _child '])) {                    $this->findchild ($val [' _child ']);                }                    }    return $tree;}

/** * Converts the returned data set to tree * @access public * @param array $list the dataset to be converted * @param string $pid the parent tag field * @param string $level    Level tag field * @return array */function list_to_tree ($list, $PK = ' id ', $pid = ' pid ', $child = ' _child ', $root =0) {//Create Tree    $tree = Array ();        if (Is_array ($list)) {//creates an array reference based on the primary key $refer = Array ();        foreach ($list as $key = + $data) {$refer [$data [$PK]] =& $list [$key];            } foreach ($list as $key + $data) {//To determine if there is a parent $parentId = $data [$pid];            if ($root = = $parentId) {$tree [] =& $list [$key];                    }else{if (isset ($refer [$parentId])) {$parent =& $refer [$parentId];                $parent [$child] [] =& $list [$key]; }}}} return $tree;} /** * Sort Query Result set * @access public * @param array $list Query result * @param string $field sorted field name * @param array $sortby sort type * AS C Forward Sort desc reverse SortNat Natural Sort * @return Array */function list_sort_by ($list, $field, $sortby = ' asc ') {if (Is_array ($list)) {$refer = $resu       Ltset = Array ();       foreach ($list as $i = + $data) $refer [$i] = & $data [$field];                Switch ($sortby) {case ' ASC '://forward sort asort ($refer);           Break                Case ' desc '://Reverse sort arsort ($refer);           Break                Case ' NAT '://Natural sort natcasesort ($refer);       Break       } foreach ($refer as $key = + $val) $resultSet [] = & $list [$key];   return $resultSet; } return false;} /** * Search Data list * @access public * @param array $list data list * @param mixed $condition query criteria * Supports array (' name ' = = $value) or Name= $value * @return array */function list_search ($list, $condition) {if (is_string ($condition)) Parse_str ($cond    Ition, $condition);    Returns the result set $resultSet = Array (); foreach ($list as $key = + $data) {$find = FalSe foreach ($condition as $field = + $value) {if (Isset ($data [$field])) {if (0 = = = Strpos ($value, '/')                ) {$find = Preg_match ($value, $data [$field]);                }elseif ($data [$field]== $value) {$find = true;    }}} if ($find) $resultSet [] = & $list [$key]; } return $resultSet;}