Bug #14607: Nested "foreach" (on the same array variable) don't work as should

From: TheWizardRK@yahoo.com Operating system: Windows 98 PHP version: 4.0.6 PHP Bug Type: Scripting Engine problem Bug description: Nested "foreach" (on the same array variable) don't work as should 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 bug report at: http://bugs.php.net/?id=14607&edit=1