SplDoublyLinkedList::__construct()函数是PHP中的内置函数,用于创建新的空双链表。
用法:
public SplDoublyLinkedList::__construct( void )
参数:该函数不接受任何参数。
返回值:该函数不返回任何值。
以下示例程序旨在说明PHP中的SplDoublyLinkedList::__construct()函数:
示例1:
<?php
// Declare an empty SplDoublyLinkedList
$list = new SplDoublyLinkedList();
// Push the element into SplDoublyLinkedList
$list->push(10);
$list->push(20);
$list->push(30);
// Display the SplDoublyLinkedList
var_dump($list);
?>
输出:
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(3) { [0]=> int(10) [1]=> int(20) [2]=> int(30) } }
示例2:
<?php
// Declare an empty SplDoublyLinkedList
$list = new SplDoublyLinkedList();
// Add the element into SplDoublyLinkedList
$list->add(0, "Welcome");
$list->add(1, "to");
$list->add(2, "GeeksforGeeks");
$list->add(3, "A");
$list->add(4, "Computer");
$list->add(5, "Science");
$list->add(6, "Portal");
// Display the SplDoublyLinkedList
var_dump($list);
?>
输出:
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(7) { [0]=> string(7) "Welcome" [1]=> string(2) "to" [2]=> string(13) "GeeksforGeeks" [3]=> string(1) "A" [4]=> string(8) "Computer" [5]=> string(7) "Science" [6]=> string(6) "Portal" } }
参考: https://www.php.net/manual/en/spldoublylinkedlist.construct.php
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