php – iterator_to_array截断输出

iterator_to_array — Copy the iterator into an array
array iterator_to_array ( Traversable $iterator [,bool $use_keys = true ] )

它适用于所有Traversable接口,但为什么我在以下代码中输入错误：

$data = array(
  0 => array(
    0 => 1,),1 => array(
    0 => 2,2 => array(
    0 => 3,1 => 4,2 => 5,3 => array(
    0 => 6,4 => array(
    0 => 7,);


$it =  new RecursiveIteratorIterator(new RecursiveArrayIterator($data));

echo PHP_EOL,iterator_count($it); // 7  total correct
echo PHP_EOL,implode(iterator_to_array($it));  //745  instead of 1234567 
echo PHP_EOL,implode(iterator_to_array($it,true)); //745  instead of 1234567

但

foreach($it as $v)
{
    echo $v ;
}

产量

1234567

See online Demo