How perform USort() on an Array of Objects class definition as a method?
- by user558724
class Contact{
public $name;
public $bgcolor;
public $lgcolor;
public $email;
public $element;
public function __construct($name, $bgcolor, $lgcolor, $email, $element)
{
$this->name = $name;
$this->bgcolor = $bgcolor;
$this->lgcolor = $lgcolor;
$this->email = $email;
$this->element = $element;
}
public static function sortByName(Contact $p1, Contact $p2)
{
return strcmp($p1->name, $p2->name);
}
}
class ContactList implements Iterator, ArrayAccess
{
protected $_label;
protected $_contacts = array();
public function __construct($label)
{
$this->_label = $label;
}
public function getLabel()
{
return $this->_label;
}
public function addContact(Contact $contact)
{
$this->_contacts[] = $contact;
}
public function current()
{
return current($this->_contacts);
}
public function key()
{
return key($this->_contacts);
}
public function next()
{
return next($this->_contacts);
}
public function rewind()
{
return reset($this->_contacts);
}
public function valid()
{
return current($this->_contacts);
}
public function offsetGet($offset)
{
return $this->_contacts[$offset];
}
public function offsetSet($offset, $data)
{
if (!$data instanceof Contact)
throw new InvalidArgumentException('Only Contact objects allowed in a ContactList');
if ($offset == '')
{
$this->_contacts[] = $data;
} else
{
$this->_contacts[$offset] = $data;
}
}
public function offsetUnset($offset)
{
unset($this->_contacts[$offset]);
}
public function offsetExists($offset) {
return isset($this->_contacts[$offset]);
}
public function sort($attribute = 'name')
{
$sortFct = 'sortBy' . ucfirst(strtolower($attribute));
if (!in_array($sortFct, get_class_methods('Contact')))
{
throw new Exception('contact->sort(): Can\'t sort by ' . $attribute);
}
usort($this->contact, 'ContactList::' . $sortFct);
}
}
public function Sort($property, $asc=true)
{
// this is where sorting logic takes place
$_pd = $this->_contact->getProperty($property);
if ($_pd == null)
{
user_error('Property '.$property.' does not exist in class '.$this->_contact->getName(), E_WARNING);
return;
}
// set sortDescriptor
ContactList::$sortProperty = $_pd;
// and apply sorting
usort($this->_array, array('ContactList', ($asc?'USortAsc':'USortDesc')));
}
function getItems(){
return $this->_array;
}
class SortableItem extends ContactList
{
static public $sortProperty;
static function USortAsc($a, $b)
{
/*@var $_pd ReflectionProperty*/
/*
$_pd = self::$sortProperty;
if ($_pd !== null)
{
if ($_pd->getValue($a) === $_pd->getValue($b))
return 0;
else
return (($_pd->getValue($a) < $_pd->getValue($b))?-1:1);
}
return 0;
}
static function USortDesc($a, $b)
{
return -(self::USortAsc($a,$b));
}
}
This approach keeps giving me PHP Warnings: usort() [function.usort]: of all kinds which I can provide later as needed to comment out those methods and definitions in order to test and fix some minor bugs of our program.
**$billy parameters are already defined.
$all -> addContact($billy);
// --> ended up adding each contact manually above
$all->Sort('name',true);
$items = $all->getItems();
foreach($items as $contact)
{
echo $contact->__toString();
}
$all->sort();
The reason for using usort is to re-arrange the order alphabetically by name but somehow is either stating that the function comparison needs to be an array or another errors which obviously I have seemed to pass. Any help would be greatly appreciated, thanks in advance.
