ID: 14607
User updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
Old Status: Feedback
Status: Open
Bug Type: Scripting Engine problem
Operating System: Windows 98
PHP Version: 4.0.6
New Comment:
$tree = Array(
[1] => Array ( [parentid] => 0, [name] => '1' )
[2] => Array ( [parentid] => 0, [name] => '2' )
[3] => Array ( [parentid] => 1, [name] => '1_1' )
[4] => Array ( [parentid] => 3, [name] => '1_1_1' )
[5] => Array ( [parentid] => 3, [name] => '1_1_2' )
[6] => Array ( [parentid] => 4, [name] => '1_1_1_1' )
[7] => Array ( [parentid] => 1, [name] => '1_2' )
[8] => Array ( [parentid] => 7, [name] => '1_2_1' )
[9] => Array ( [parentid] => 2, [name] => '2_1' )
);
// Recursion using a copy of the variable each time
// WORKS
function funktzia1($base,$dir)
{
foreach($dir as $id => $item)
{
if ($item[parentid]==$base)
{
echo
"<UL>\n<LI>".$item[name]."</LI><BR>\n";
funktzia1($id,$dir);
echo "</UL>\n";
}
}
}
// Print the tree using the first function
funktzia1(0,$tree);
// Recursion using the same variable - pass by reference (note the "&" before the
"$dir")
// DOESN'T WORK
function funktzia2($base,&$dir)
{
foreach($dir as $id => $item)
{
if ($item[parentid]==$base)
{
echo
"<UL>\n<LI>".$item[name]."</LI><BR>\n";
funktzia2($id,$dir);
echo "</UL>\n";
}
}
}
// Print the tree using the second function
funktzia2(0,$tree);
Previous Comments:
------------------------------------------------------------------------
[2001-12-19 18:31:46] [EMAIL PROTECTED]
Please provide a compelte self-contained copy&paste ready script.
Feedback.
------------------------------------------------------------------------
[2001-12-19 15:17:21] [EMAIL PROTECTED]
1. Actually doing a "reset()" doesn't work at all.
2. I thought that this was a duplicate of #5052 - but now I see that there's too
different variables there for each level of the nested "foreach()" - and I use the
same variable.
So it seems that this is not a duplicate after all (corrent me if I'm wrong).
------------------------------------------------------------------------
[2001-12-19 15:00:55] [EMAIL PROTECTED]
It seems that this has been pointed out before... Sorry.
But this is still not solved (although the other bug reports about this are already
marked as "closed"). :(
I only saw a solution of using "reset()" in the end of the loop, but this doesn't seem
to be a good solution.
Any chances that each "foreach()" will be made to work on a new copy of the array, so
that nested "foreach()" will work?
------------------------------------------------------------------------
[2001-12-19 14:46:50] [EMAIL PROTECTED]
I have a tree, which is loaded into a variable into the following (hopefully
self-explanatory) structure:
Array(
[1] => Array ( [parentid] => 0, [name] => 1 )
[2] => Array ( [parentid] => 0, [name] => 2 )
[3] => Array ( [parentid] => 1, [name] => 1_1 )
[4] => Array ( [parentid] => 3, [name] => 1_1_1 )
[5] => Array ( [parentid] => 3, [name] => 1_1_2 )
[6] => Array ( [parentid] => 4, [name] => 1_1_1_1 )
[7] => Array ( [parentid] => 1, [name] => 1_2 )
[8] => Array ( [parentid] => 7, [name] => 1_2_1 )
[9] => Array ( [parentid] => 2, [name] => 2_1 )
)
This results in the following three:
+ 1
+ 1_1
+ 1_1_1
+ 1_1_1_1
+ 1_1_2
+ 1_2
+ 1_2_1
+ 2
+ 2_1
I have the following recursive function to draw this tree:
function funktzia($base,$dir)
{
foreach($dir as $id => $item)
{
if ($item[parentid]==$base)
{
echo "<UL>\n<LI>".$item[name]."</LI><BR>\n";
funktzia($id,$dir);
echo "</UL>\n";
}
}
}
where `$base' is the current tree node id, and `$dir' is the variable which holds the
tree, as described above.
The function is initially called "funktzia(0,$tree);", and the recursively calls
itself.
So far so good.
But if the `$dir' variable is a by-reference parameter (i.e. "[...] &$dir [...]"
instead of "[...] $dir [...]" as now), or it is defined global within the function
instead of being passed as a parameter (in either way, all recursion level use the
same variable) - it doesn't work.
It draw the tree only while going up levels, but stop when it's time to go back to a
lower level. Or in short, the following tree is drawn instead of the full one:
+ 1
+ 1_1
+ 1_1_1
+ 1_1_1_1
It seems that when we go back to the lower "foreach" loop, the array pointer it uses
already points to the end of the array (since we just finished doing a "foreach" loop
on that array in the higher level).
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=14607&edit=1
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