SplDoublyLinkedList::add()函數是PHP中的內置函數,用於在給定索引處添加新值。
用法:
void SplDoublyLinkedList::add( $index, $newval )
參數:它包含上麵提到和下麵描述的兩個參數:
- $index:它保存要在其中插入新元素的索引值。
- $newval:它包含要插入或添加的元素。
返回值:它不返回任何值。
以下示例程序旨在說明PHP中的SplDoublyLinkedList::add()函數:
示例1:
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList;
// Use SplDoublyLinkedList::add() function to
// add elements to the SplDoublyLinkedList
$list->add(0, 1);
$list->add(1, "Geeks");
$list->add(2, "G");
$list->add(3, 10);
print_r($list);
?>
輸出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 1 [1] => Geeks [2] => G [3] => 10 ) )
示例2:
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList;
// Use SplDoublyLinkedList::add() function to
// add elements to the SplDoublyLinkedList
$list->add(0, 30);
$list->add(1, 20);
$list->add(2, 30);
$list->add(3, "Geeks");
$list->add(4, 'G');
print_r($list);
?>
輸出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 30 [1] => 20 [2] => 30 [3] => Geeks [4] => G ) )
參考: https://www.php.net/manual/en/spldoublylinkedlist.add.php
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