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关于多维数组降维、深度和获取父键的问题

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我有一个数组，结构是这样的： 
$json = '[{"id":27,"children":[{"id":28,"children":[{"id":30},{"id":29}]}]},{"id":31},{"id":32}]';$arry = json_decode($json,true);

也有可能是这样的结构： 
$json = '[{"id":27,"children":[{"id":30,"children":[{"id":31}]}]},{"id":28,"children":[{"id":29}]},{"id":32}]';$arry = json_decode($json,true);


也就是说层数、顺序都不是固定的。
我想把他降为一维数组，并记录下每一个一维数组的深度，对应的父键等

以下是第二个数组期望得到的结果： 
Array ([0] => Array ( [id] => 27 [level] => 0 [parent] => 0 )[1] => Array ( [id] => 30 [level] => 1 [parent] => 27 )[2] => Array ( [id] => 31 [level] => 2 [parent] => 30 )[3] => Array ( [id] => 28 [level] => 0 [parent] => 0 )[4] => Array ( [id] => 29 [level] => 1 [parent] => 28 )[5] => Array ( [id] => 32 [level] => 0 [parent] => 0 ) )


想了一晚上了。。。请大神帮帮忙


回复讨论(解决方案)

$json = '[{"id":27,"children":[{"id":30,"children":[{"id":31}]}]},{"id":28,"children":[{"id":29}]},{"id":32}]';$arry = json_decode($json,true);print_r(foo($arry));function foo($ar, $level=0, $parent=0, &$res=array()) {  foreach($ar as $v) {    $t = array();    $v['level'] = $level;    $v['parent'] = $parent;    if(isset($v['children'])) {      $t = $v['children'];      unset($v['children']);    }    $res[] = $v;    if($t) foo($t, $level+1, $v['id'], $res);  }  return $res;}
Array(    [0] => Array        (            [id] => 27            [level] => 0            [parent] => 0        )    [1] => Array        (            [id] => 30            [level] => 1            [parent] => 27        )    [2] => Array        (            [id] => 31            [level] => 2            [parent] => 30        )    [3] => Array        (            [id] => 28            [level] => 0            [parent] => 0        )    [4] => Array        (            [id] => 29            [level] => 1            [parent] => 28        )    [5] => Array        (            [id] => 32            [level] => 0            [parent] => 0        ))

$json = '[{"id":27,"children":[{"id":30,"children":[{"id":31}]}]},{"id":28,"children":[{"id":29}]},{"id":32}]';$arry = json_decode($json,true);print_r(foo($arry));function foo($ar, $level=0, $parent=0, &$res=array()) {  foreach($ar as $v) {    $t = array();    $v['level'] = $level;    $v['parent'] = $parent;    if(isset($v['children'])) {      $t = $v['children'];      unset($v['children']);    }    $res[] = $v;    if($t) foo($t, $level+1, $v['id'], $res);  }  return $res;}
Array(    [0] => Array        (            [id] => 27            [level] => 0            [parent] => 0        )    [1] => Array        (            [id] => 30            [level] => 1            [parent] => 27        )    [2] => Array        (            [id] => 31            [level] => 2            [parent] => 30        )    [3] => Array        (            [id] => 28            [level] => 0            [parent] => 0        )    [4] => Array        (            [id] => 29            [level] => 1            [parent] => 28        )    [5] => Array        (            [id] => 32            [level] => 0            [parent] => 0        ))



啊！！！！
十分感谢！ 
    if(isset($v['children'])) {      $t = $v['children'];      unset($v['children']);    }

这一步我实在想不出来。

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