Script

<?php
/**
Copyright Rolf Fredriksson ROSiRO Dec 2018. https://www.webman.se

General class that collects a recursive tree of tree objects from database.
Uses 4 fields: id, parent_id, name and place from a given table stored in
the global variable $db_table. The top parent id is 0 and all other objects
must track up to this.

The class can be changed by altering the sql question, for instance
to display and sort on other fields or by adding a global variable
to keep track on which parts of the Tree that is in use.

Use like this:
// 1. Create top object: id, path to parent, name
$oTree = new Tree(0, array(0), 'top');

// 2. Build a tree of Tree objects: Tree object, path
$oTree->buildTree($oTree, array(0));

// 3. Use the object (as many times you want)
function showTree($oTree) {
	foreach($oTree->getSubtrees() as $o) {
		echo $o->getName(), '<br />';
		// Do something more...
		showTree($o); // Recursive call
	}
}
showTree($oTree);
*/

class Tree {
	
	protected $id;       // int
	protected $aPath;    // array of parent ids, from top level down
	protected $name;     // str
	protected $subtrees; // array of objects
	
	function __construct($id, $aPath, $name) {
		$this->id       = intval($id);
		$this->aPath    = $aPath;
		$this->name     = $name;
		$this->subtrees = array();
	}
	
	function buildTree($oTree, $aPath) {

		global $conn, $db_table;

		// Get last id from path and use it as parent to get the sub-items...
		$sql = "select * from " . $conn->escape($db_table) .
		" where parent_id = " . $aPath[count($aPath) - 1] . " order by place";
		$rs = $conn->getResult($sql);
		
		foreach (new LimitIterator($rs, 0) as $row) {
			
			// Copy the path array and add the new id...
			$path = $aPath; 
			$path[] = $row['id'];
			
			// Create and add a new sub-tree with that id and path...
			$tree = new Tree($row['id'], $path, $row['name']);
			$oTree->subtrees[] = $tree;
			
			// Build the new tree...
			$this->buildTree($tree, $path); // Recursive call
			
		}
		
	}
	
	function getId()       { return $this->id; }
	function getParentId() { return $this->aPath[count($this->aPath) - 2]; }
	function getPath()     { return $this->aPath; }
	function getLevel()    { return count($this->aPath) - 2; }
	function getName()     { return $this->name; }
	function getSubtrees() { return $this->subtrees; }

} ?>

In windows cmd:
tracert -d www.mydomain.com

#theCalcDiv {
    background:green;
    height: -moz-calc(100% - (20px + 30px));
    height: -webkit-calc(100% - (20px + 30px));
    height: calc(100% - (20px + 30px));
    display:block
}

select sku, count(*)
from trading_units
where sku is not null
and sku != ''
group by sku
having count(*) > 1;

Skottår:
Sker vart fjärde år, men en extra skottdag läggs till vart 100:e år.

"If the year is the last year of a century, eg. 1700, 1800, 1900, 2000,
then it is only a leap year if it is exactly divisible by 400.
Therefore, 1900 wasn't a leap year but 2000 was."

Veckonummer:
Vecka 1 är alltid den första veckan som innehåller minst 4 dagar,
beroende på vilken veckodag som anses som den första dagen i veckan.