SplDoublyLinkedList::add

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

SplDoublyLinkedList::add — Add/insert a new value at the specified index

说明

public SplDoublyLinkedList::add(int $index, mixed $value): void

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

参数

index: The index where the new value is to be inserted.
value: The new value for the index.

返回值

没有返回值。

错误／异常

Throws OutOfRangeException when index is out of bounds or when index cannot be parsed as an integer.

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User Contributed Notes 2 notes

down

lincoln dot du dot j at gmail dot com ¶

6 years ago

$a = new SplDoublyLinkedList;
$arr=[1,2,3,4,5,6,7,8,9];

for($i=0;$i<count($arr);$i++){
    $a->add($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
        )

)

down

-6

gandung at ppp dot cylab dot cmu dot edu ¶

6 years ago

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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