/**
* Construct an array object from a string of comma separated items
*
* @param string $input a string of comma separated items
*/
function __construct($input)
{
if (is_string($input)) {
$input = strlen($input) ? array_map('trim', explode(',', $input)) : array();
}
parent::__construct((array) $input);
}
/**
* Unsets the value at the specified index
* value is moved to internal deleted collection
*
* @see ArrayObject::offsetUnset()
* @throws InvalidArgumentException
*/
function offsetUnset($index)
{
if ($this->offsetExists($index)) {
$this->deleted[] = $this->offsetGet($index);
}
return parent::offsetUnset($index);
}
/**
* Constructor
*
* @param array $input
* @param int $flags
* @param string $iteratorClass
*/
public function __construct($input = array(), $flags = self::STD_PROP_LIST, $iteratorClass = 'ArrayIterator')
{
parent::__construct(array(), $flags, $iteratorClass);
$this->exchangeArray($input);
}