SplDoublyLinkedList::prev()函数是PHP中的内置函数,用于移至上一个条目。
用法:
void SplDoublyLinkedList::prev( void )
参数:该函数不接受任何参数。
返回值:它不返回任何值。
以下示例程序旨在说明PHP中的SplDoublyLinkedList::prev()函数:
示例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 SplDoublyLinkedList::prev() function
// to move to previous entry
$list->prev();
// Display doubly linked list
print_r($list);
?>
输出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 30 [1] => 20 [2] => 30 [3] => Geeks [4] => G ) )
示例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 SplDoublyLinkedList::prev() function
// to move to previous entry
$list->prev();
// Display doubly linked list
var_dump($list);
?>
输出:
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(8) [4]=> int(5) } }
参考: https://www.php.net/manual/en/spldoublylinkedlist.prev.php
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