I have a very similar situation to this post
PHP: nested menu with a recursive function, expand only some nodes (not all the tree)
and I need some help...
Here is the (partial) contents of my $menuJSONArray variable (used when calling the function):
Array
(
[0] => Array
(
[Menu_IDX] => 1
[Order] => 1
[Name] => History
[Parent] =>
[Path] => History
[Link] =>
)
[1] => Array
(
[Menu_IDX] => 2
[Order] => 25
[Name] => Review
[Parent] =>
[Path] => Review
[Link] => Review
)
[2] => Array
(
[Menu_IDX] => 3
[Order] => 35
[Name] => Past Medical History
[Parent] =>
[Path] => Past Medical History
[Link] => Past Medical History
)
[3] => Array
(
[Menu_IDX] => 4
[Order] => 45
[Name] => Item 1
[Parent] => 0
[Path] => Item 1
[Link] => Item 1
)
[4] => Array
(
[Menu_IDX] => 5
[Order] => 55
[Name] => Item 2
[Parent] => 0
[Path] => Item 2
[Link] => Item 2
)
[5] => Array
(
[Menu_IDX] => 6
[Order] => 65
[Name] => Item 3
[Parent] => 0
[Path] => Item 3
[Link] => Item 3
)
)
and so on...
I am using the function below but I keep getting stuck in the loop at the first item. Really need some help wrapping my brain around this function. Thank you all ahead of time, this community rocks!!
///RECURSIVE MENU
function recursive($parent, $array) {
$has_children = false; //set value of has children to false by default
foreach($array as $key => $value) { //loop through the array as key-value pairs
if ($value['Parent'] == $parent) { //if the value of Parent field is equal to parent variable
if ($has_children === false && $parent) { //if children is false but parent is not null, this is a sub item
$has_children = true; //children is true
echo '<ul>' ."\n"; //create parent menu ul
} //otherwise just create the item
echo '<li>' . "\n"; //create li for parent menu item
echo '<a href="'.$value['Path'].'">' . $value['Name'] . '</a>' . " \n"; //create link for menu item
recursive($key, $array); //create sub menu
echo "</li>\n"; //end parent menu item
}
}
if ($has_children === true && $parent) echo "</ul>\n"; //end parent menu
}
?>
<?php echo recursive(0, $menuJSONArray); ?></ul>
What I get in return is:
<ul>
<li>
<a href="History">History</a>
<li>
<a href="History">History</a>
<li>
<a href="History">History</a>
<li>
<a href="History">History</a>
<li>
<a href="History">History</a>
<li>
<a href="History">History</a>
Can't seem to get out of this loop. Thanks!!
PS I am not concerned with the collapsing of the tree etc. from the referenced post as I will be handling that with jquery and css. I just cannot get the proper output of the menu syntax.
As I agree with @Tim Withers I start to solve problem from preparing current array:
function prepareMenu($array)
{
$return = array();
//1
krsort($array);
foreach ($array as $k => &$item)
{
if (is_numeric($item['Parent']))
{
$parent = $item['Parent'];
if (empty($array[$parent]['Childs']))
{
$array[$parent]['Childs'] = array();
}
//2
array_unshift($array[$parent]['Childs'],$item);
unset($array[$k]);
}
}
//3
ksort($array);
return $array;
}
Some explanation.
Then function to build menu:
function buildMenu($array)
{
echo '<ul>';
foreach ($array as $item)
{
echo '<li>';
echo $item['Name'];
if (!empty($item['Childs']))
{
buildMenu($item['Childs']);
}
echo '</li>';
}
echo '</ul>';
}
With this and proper array order, no matter how deep rabbit hole is - you have your tree.
Usage:
$menu = prepareMenu($menu);
buildMenu($menu);
Of course... There must be better way... :-P
EDIT:
For array (a little midification [next child]):
$menu = array(
array(
'Menu_IDX' => '1',
'Order' => '1',
'Name' => 'History',
'Parent' => '',
'Path' => 'History',
'Link' => '',
),
array
(
'Menu_IDX' => '2',
'Order' => '25',
'Name' => 'Review',
'Parent' => '',
'Path' => 'Review',
'Link' => 'Review',
),
array
(
'Menu_IDX' => '3',
'Order' => '35',
'Name' => 'Past Medical History',
'Parent' => '',
'Path' => 'Past Medical History',
'Link' => 'Past Medical History',
),
array
(
'Menu_IDX' => '4',
'Order' => '45',
'Name' => 'Item 1',
'Parent' => '0',
'Path' => 'Item 1',
'Link' => 'Item 1',
),
array
(
'Menu_IDX' => '5',
'Order' => '55',
'Name' => 'Item 2',
'Parent' => '0',
'Path' => 'Item 2',
'Link' => 'Item 2',
),
array
(
'Menu_IDX' => '6',
'Order' => '65',
'Name' => 'Item 3',
'Parent' => '0',
'Path' => 'Item 3',
'Link' => 'Item 3',
),
array
(
'Menu_IDX' => '7',
'Order' => '65',
'Name' => 'Item 31',
'Parent' => '5',
'Path' => 'Item 31',
'Link' => 'Item 31',
)
);
Output will be:
Plenty of detail in your question, that's great.
Looking at the code, the first issue I see is with the line:
if ($value['Parent'] == $parent) {
The first time you enter the foreach loop, $value['Parent']
is NULL
, and $parent
is 0
.
Because you are doing a ==
comparison, this evaluates to TRUE
. Try instead:
if ($value['Parent'] === $parent) {
Note the ===
. This also checks the data type and requires it to match as well.
The second issue will then be with the line:
if ($has_children === false && $parent) { //if children is false but parent is not null, this is a sub item
The comment makes it clear that you want to check that $parent
is not null, but you aren't doing that, you are casting the integer value of $parent
to a Boolean, so 0
will be treated as FALSE
, and anything else as TRUE
.
Try instead:
if ($has_children === false && !is_null($parent)) { //if children is false but parent is not null, this is a sub item.
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