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(PHP 5 >= 5.0.0)
ArrayIterator::__construct — Construct an ArrayIterator
$array  = array() 
   [,  int $flags  = 0 
  ]] )Constructs an ArrayIterator object .
本函数还未编写文档,仅有参数列表。
array The array or object to be iterated on.
flags Flags to control the behaviour of the ArrayIterator object. See ArrayIterator::setFlags() .
An ArrayIterator object .
ArrayIterator::__construct() throws an InvalidArgumentException if anything besides an array or an object is given.
[#1] foobuilder at gmail dot com [2010-11-02 09:54:38]
The method description looks like it requires a parameter, but it is actually optional: 
$iter= new ArrayIterator(); 
$iter['bacon'] = 'tasty';