Zend framework foreach loop stop ate the first iteration - php

Question

I'm actually working on ZF. I have a category table with which, I want to create a tree in order to get display the data as below :
Category
--Sub cat 1
--Sub cat 2
----Su sub cat 1
Another Category
--Sub cat 1
//...etc...
I'm using the fetchAll method to get all my data. Everyting works fine. But then I'm now trying to create my tree into a double foreach loop as below :
$tree = array();
foreach($data as $parent){
$tree[$parent->name] = array();
foreach($data as $child){
if($child->parent_id == $parent->id){
$tree[$parent->name][] = $child->name;
}
}
}
The problem is that the loop stop after the main loop first iteration so I'm just getting the first parent and it's sub category but it does not continue to the second parent.
My database table as the following fields :
id, name, parent_id
Any idea?
EDIT
Thanks to you Thibault, it did work using the good old for loop :
for($i=0;$i<count($data);$i++){
$tree[$data[$i]->name] = array();
for($j=0;$j<count($data);$j++){
if($data[$j]->parent_id == $data[$i]->id){
$tree[$data[$i]->name][] = $data[$j]->name;
}
}
}

Answer 1

You may have a conflict between the cursor of both $data variables.
You should use a copy of $data for the second foreach loop.
Or use for loops with $i and $j index, and call them via $data[$i] and $data[$j] to access the array, so the loops don't get messed up.
EDIT
Happy i could help, but after some research, i created this piece of code :
<?
class o {
public $id;
public $name;
public $parent_id;
function __construct($_id,$_name,$_parent) {
$this->id = $_id;
$this->name = $_name;
$this->parent_id = $_parent;
}
}
$data = array(
new o(1,'toto',0),
new o(2,'truc',1),
new o(3,'machin',1),
new o(4,'bidule',2),
new o(5,'titi',3),
new o(6,'tutu',3),
);
$tree = array();
foreach($data as $parent){
$tree[$parent->name] = array();
foreach($data as $child){
if($child->parent_id == $parent->id){
$tree[$parent->name][] = $child->name;
}
}
}
print_r($tree);
And your code works just fine :
(something must be wrong somewhere else ...)
Array
(
[toto] => Array
(
[0] => truc
[1] => machin
)
[truc] => Array
(
[0] => bidule
)
[machin] => Array
(
[0] => titi
[1] => tutu
)
[bidule] => Array
(
)
[titi] => Array
(
)
[tutu] => Array
(
)
)