3-dimensional Arrays -> How?

[spstieng]

I'm unsuccessfully trying to define a 3 dimensional array in PHP.

Explaining a bit of my code here.....

The menu items are stored in a DB:

$result = @mysql_query('SELECT _ID, _Parent, MenuName FROM ws_menustructure') or die (mysql_error());
$arrResult = array( array (Parent),  array (MenuName) );

// Put fetched data into a managable array
while ($row = mysql_fetch_assoc($result)) 
{
	$arrResult[$i]['Parent']= $row['_Parent'];
	  $arrResult[$i]['MenuName']= $row['MenuName'];
	$i++;
}

Alright, I've got the entire menustructure in an array now.
I do this to avoid more request to the SQL server.

Now, the each menu item can be 2 levels deep (3 levels in total with the top). So I want to structure the read data into a 3dim array.

Is this the correct way of defining my 3d array?:

$arrMenuStruct	= array(
					'Level1' => array(array (Parent),  array (MenuName)),
					'Level2' => array(array (Parent),  array (MenuName)),
					'Level3' => array(array (Parent),  array (MenuName))
					);

So, if;
element 4 on Level 1 is HDD,
element 2 on Level 2 is S-ATA,
element 1 on Level 3 is 7200 RPM

I can write out the menuitem (7200 RPM) by:

echo $arrMenuStruct[4][2][3]['MenuName'];

????

I am trying to write a menu tree structure.
Have looked at different sources... but still haven't quite figured it out yet.

And I cannot find any good examples on using 3-dimensional arrays. Only 2D which is pretty easy.......

[matto]

$arrMenuStruct[4][2][3]['MenuName'];
this is a 4-dim array!

don't mix up (a) associative and enumerative arrays and (b) the level order:

$arr = array('bla', 'bli', 'blo');

would be the same as

$arr = array(0 => 'bla', 1 => 'bli', 2 => 'blo');
just that with enumerative arrays you don't write down the keys.

now add a dimension:

$arr = array(array(1,2,3), array(7,8,9));

so that (note the dimenstion notation order):
$arr[1][2] gives 9. (numbering starts with 0!)

add another dimension:

	array(
		array(
			array(1,2), 
			array(3,4)
			), 
		array(
			array(5,6), 
			array(7,8)
			)
		)

and $arr[0][1][0] gives 3.

once you see through this, try turning parts of this array monster into an associative array.

	array(
		array(
			"labels" => array(1,2), 
			"items"  => array(3,4)
			), 
		array(
			"labels" => array(5,6), 
			"items"  => array(7,8)
			)
		)

$arr[1]['items'][0] gives 7.

hope this gets you on track 🙂

[spstieng]

Thanks Matto, it helped me a bit on the way.
Now I get some other weird fault..... posting new msg.

Thanks!

😃