PHP使用两个表创建树形视图

Question

i have two mysql tables

  1. questions
  2. answers 

the question table has question and answer table has related answers each answer point to a question so it has levels

ex

question 1 -> answer 1 -> question 2
           -> answer 2 -> question 3
           -> answer 3 -> question 4 -> answer 1 -> question 5
                                     -> answer 2 -> question 6
                                     -> answer 3 -> question 7
question 8 -> answer 1 -> question 9
           -> answer 2 -> question 10-> answer 1 ->question 12
                                        answer 2 ->question 13
           -> answer 3 -> question 11 

i need to show questions as tree view

ex

question 1->question2
            question3
            question4->question 5
                       question 6
                       question 7
question 8->question 9
            question 10->question 12
                         question 13
            question 11

my question table fields are

id  qtype   qtext

my answeres table fields are

id  answer  quzid   targetquz

Anyone know how to create a treeview using php based on this two tables. thank you very much.

Answer 1

Hope I'm not misunderstanding things here (not sure if you have intentionally question pointing to answer then to another question without any answer); but generally speaking I would use while loop.

while()
{ first level here
while()
{ second level here
while()
{ third level here
....
}
}
}