SplDoublyLinkedList::unshift()函數是PHP中的內置函數,用於將元素添加到雙向鏈表的開頭。
用法:
void SplDoublyLinkedList::unshift( $value )
參數:該函數接受單個參數$value,該參數用於取消雙鏈表中的值。
返回值:它不返回任何值。
以下示例程序旨在說明PHP中的SplDoublyLinkedList::unshift()函數:
程序1:
<?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');
// Use unshift() function
$list->unshift("GeeksforGeeks");
// Display the list elements
print_r($list);
?>
輸出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => GeeksforGeeks [1] => 30 [2] => 20 [3] => 30 [4] => Geeks [5] => G ) )
程序2:
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList();
// Use SplDoublyLinkedList::push() function to
// add elements to the SplDoublyLinkedList
$list->push(1);
$list->push(2);
$list->push(3);
$list->push(8);
$list->push(5);
// Use unshift() function
$list->unshift("Geeks");
// Display the list elements
print_r($list);
?>
輸出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => Geeks [1] => 1 [2] => 2 [3] => 3 [4] => 8 [5] => 5 ) )
參考: https://www.php.net/manual/en/spldoublylinkedlist.unshift.php
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