SplDoublyLinkedList::prev()函數是PHP中的內置函數,用於移至上一個條目。
用法:
void SplDoublyLinkedList::prev( void )
參數:該函數不接受任何參數。
返回值:它不返回任何值。
以下示例程序旨在說明PHP中的SplDoublyLinkedList::prev()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, 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);
?>
輸出:
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);
?>
輸出:
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)
}
}
參考: https://www.php.net/manual/en/spldoublylinkedlist.prev.php
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注:本文由純淨天空篩選整理自jit_t大神的英文原創作品 PHP | SplDoublyLinkedList prev() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。
