Menus & Navigation
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<?php
// Recusive tree function
//
function tree($id_parent = 0, $indent = 0)
{
global $g_tree, $ret_tree;
$tt = array();
$x = 0;
$loop = 0;
foreach($g_tree as $n)
{
if( $n['id_parent'] == $id_parent)
{
$tt[$x++] = $loop;
}
$loop++;
}
/*-- if there are some parent ids --*/
if( $x != 0){
foreach($tt as $d)
{
$tmp = array();
foreach($g_tree[$d] as $key => $value)
{
$tmp[$key] = $value;
}
$tmp['indent'] = $indent;
$ret_tree[] = $tmp;
tree($tmp['id'], $indent+1);
}
}
else
{
return;
}
}
// Example of how to use it
//
// This is your tree structure. It should be sorted by titles
//
$g_tree = array();
$g_tree[] = array(
'id' => 1,
'id_parent' => 0,
'title' => 'Astronomy'
);
$g_tree[] = array(
'id' => 2,
'id_parent' => 1,
'title' => 'Radio-Astronomy'
);
$g_tree[] = array(
'id' => 3,
'id_parent' => 2,
'title' => 'Radio-Observatories'
);
$g_tree[] = array(
'id' => 4,
'id_parent' => 0,
'title' => 'Physics'
);
$g_tree[] = array(
'id' => 5,
'id_parent' => 4,
'title' => 'Lasers'
);
$g_tree[] = array(
'id' => 6,
'id_parent' => 4,
'title' => 'Photonics'
);
// This the the return array with indents
//
$ret_tree = array();
// __Recursive function call__
// If you want to print out only
// a subtree you have to modify the first value
// of this function to the id of the subtree
//
tree(0,0);
//Print the tree structure with indents
//
foreach($ret_tree as $cat)
{
$indent = '';
for($i=0;$i<$cat['indent'];$i++)
{
$indent .= '___';
}
echo $indent.$cat['title'].'<br>';
}
?>
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Usage Example
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