PHP多維陣列轉換成二維數組

目前有個階層不規則的多維陣列，需要轉換成二維數組，還請請教各位大蝦。
來源資料如下。

$a = Array('0' => Array(     'id' => '125','level' => '0','child' => Array(        '0' => Array('id' => '189' ,'level' => '1','child' => Array(            '0' => Array( 'id' => '425', 'level' => '2','child' => Array(                '0' => Array( 'id' => '385', 'level' => '3' ),                 '1' => Array( 'id' => '782', 'level' => '3' ), ), ), ), ), '1' => Array('id' => '688','level' => '1'),),),);

上述格式的數組結構層次較多，看起來比較亂，如果通過chrome配合phpview外掛程式查看的話，結構是這樣的。

Array('0' => Array('id' => '125','level' => '0','parent_id'='0'),'1' => Array('id' => '189','level' => '1','parent_id'='125'),'2' => Array('id' => '425','level' => '2','parent_id'='189'),'3' => Array('id' => '385','level' => '3','parent_id'='425'), '4' => Array('id' => '782','level' => '3','parent_id'='425'), '5' => Array('id' => '688','level' => '1','parent_id'='125'));

這裡的每個parent_id是上層數組的id,第一層的parent_id是0

回複內容：

目前有個階層不規則的多維陣列，需要轉換成二維數組，還請請教各位大蝦。
來源資料如下。

$a = Array('0' => Array(     'id' => '125','level' => '0','child' => Array(        '0' => Array('id' => '189' ,'level' => '1','child' => Array(            '0' => Array( 'id' => '425', 'level' => '2','child' => Array(                '0' => Array( 'id' => '385', 'level' => '3' ),                 '1' => Array( 'id' => '782', 'level' => '3' ), ), ), ), ), '1' => Array('id' => '688','level' => '1'),),),);

上述格式的數組結構層次較多，看起來比較亂，如果通過chrome配合phpview外掛程式查看的話，結構是這樣的。

Array('0' => Array('id' => '125','level' => '0','parent_id'='0'),'1' => Array('id' => '189','level' => '1','parent_id'='125'),'2' => Array('id' => '425','level' => '2','parent_id'='189'),'3' => Array('id' => '385','level' => '3','parent_id'='425'), '4' => Array('id' => '782','level' => '3','parent_id'='425'), '5' => Array('id' => '688','level' => '1','parent_id'='125'));

這裡的每個parent_id是上層數組的id,第一層的parent_id是0

做個遞迴處理吧

function reformat($arrTmp, $parent_id=0, &$ret=null) {    foreach($arrTmp as $k => $v) {        $ret[$v['id']] = array('id'=>$v['id'], 'level'=>$v['level'], 'parent_id'=>$parent_id);        if($v['child']) {            reformat($v['child'], $v['id'], $ret);        }    }    return $ret;}var_dump(reformat($a));

不客氣

class Test{    public function reduce_arr ($arr) {        static $temp = array(); // 聲明了一個靜態局部變數        foreach ($arr as $key => $val) {            if (is_array($val)) {                $this->reduce_arr($val);            } else {                $temp[$key] = $val;            }        }        return $temp;    }}

