SplDoublyLinkedList::add()

(PHP 5 >= 5.5.0, PHP 7)

Add/insert a new value at the specified index

说明

Insert the value$newvalat the specified$index, shuffling the previous value at that index (and all subsequent values) up through the list.

参数

The index where the new value is to be inserted.

The new value for the$index.

返回值

没有返回值。

错误／异常

ThrowsOutOfRangeExceptionwhen$indexis out of bounds or when$indexcannot be parsed as an integer.

$a = new SplDoublyLinkedList;
$arr=[1,2,3,4,5,6,7,8,9];
for($i=0;$iadd($i,$arr[$i]);
}
print_r($a);
//Output:
SplDoublyLinkedList Object
(
  [flags:SplDoublyLinkedList:private] => 0
  [dllist:SplDoublyLinkedList:private] => Array
    (
      [0] => 1
      [1] => 2
      [2] => 3
      [3] => 4
      [4] => 5
      [5] => 6
      [6] => 7
      [7] => 8
      [8] => 9
    )
)

Maybe the basic usage is like this i think..
$a = new \SplDoublyLinkedList;
if ($a instanceof \SplDoublyLinkedList) {
  $a->add(0, 'Paulus');
  $a->add(1, 'Gandung');
  $a->add(2, 'Prakosa');
  // then, iterate over that because \SplDoublyLinkedList
  // is implementing \Iterator interface.
  foreach ($a as $value) {
    echo sprintf("%s\n", $value);
  }
}

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