如題：需要把有父子結構的二維數組，把這個樹形結構的分支路徑全部遍歷出來，組成一個新的數組，最好用php語言，求大佬給個算法原始數組為$array = [         ['ID'=>'A','SD'=>'B'],         ['ID'=>'A','SD'=>'C'],         ['ID'=>'A','SD'=>'D'],         ['ID'=>'B','SD'=>'E'],         ['ID'=>'B','SD'=>'F'],         ['ID'=>'E','SD'=>'G'],         ['ID'=>'C','SD'=>'H'],         ['ID'=>'C','SD'=>'I']              ];轉化后的數組為：$targe = [     ['B','E','G'],     ['B','F'],     ['C','H'],     ['C','I'],     ['D'] ]