How PHP loops out comments and replies to MySQL table structure if there is a problem

PHP how to loop output comment and reply MySQL table structure whether there is a problem
Now do the table:
Comment form for comments and replies
+------+----+---------+--------+
| ID |uid | Content | PID |
+------+----+---------+--------+
| 1 | AA | XXXXX | NULL | This is the first article of the commentary.
| 2 | BB | AAAAAAA | 1 | This is the reply to the first comment
| 3 | CC | BBBB | 2 | Reply to the first reply
| 4 | DD | ddddddd | 3//Reply to the second reply
| 5 | DD | ddddddd | 3 |
+------+----+---------+--------+
How does this phase loop out in the program?






------Solution--------------------
Like the QQ space kind?
That's a two for loop.
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