The implementation of the Forum is more complex, as long as it analysis, the problem is solved, first look at the implementation of the Forum, someone posted, and then someone keep abreast, the relationship formed a parent-child relationship, generally write a practical forum, as long as the settlement of this sub-parent relationship, the forum has been formed.
To see the way to complete the forum, the first to use a database to record the relationship between the father, the general method is to use a duplicate ID number to complete, record the parent's ID number field is generally used "parentid" to record, the child paste storage records the ID number of the parent paste, and the parent paste ParentID rate is 0, see the number According to the record form of the library:
Parent 1:id:1 | parentid:0
Sub-1:id:2 | Parentid:1
Double 1:id:3 | Parentid:2
Parent 2:id:4 | parentid:0
Sub-2:id:5 | Parentid:4
Sub-2:id:6 | Parentid:4
......
So the database records of the child parent relationship has been established, and then to analyze how PHP to achieve the establishment of the parent-child relationship and add to the database, the first user wants to speak, his post as a parent paste, so PHP can set ParentID to 0, when there is user keep abreast, PHP will be the user with the ID of the parent paste Value to ParentID, so that PHP is complete, and the child-parent relationship is established.
To achieve the establishment and storage of child-parent relationships, the next step is to show this relationship, here you need to use a recursive function to implement, see the following code:
.....
$result =mysql_query ("SELECT * from table where parentid=0");
$num =mysql_numrows ($result);
if (!empty ($num)) {
for ($i =0; $i < $num; $i + +) {
$parentid =mysql_result ($result, $i, "id");
function Showchild ($parentid) {
Added UL control layer into
$result =mysql_query ("SELECT * from table where parentid= $parentid");
$numb =mysql_numrows ($result);
if (!empty ($numb)) {
for ($i =0; $i < $numb; $i + +) {
....
$parentid =mysql_result ($result, $i, "id");
....
Showchild ($parentid);
}
....
....
}
....
....
}
Showchild ($parentid);
....
....
}
....
....
}
The above code is the use of recursive functions to implement the Forum's approach, of course, this forum is extremely primitive, in different parts with functional code, it will be able to make this forum gradually strong, interested readers may wish to try their own hands.
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