SplDoublyLinkedList::offsetSet()函数是PHP中的内置函数,用于在给定索引处设置值。
用法:
void SplDoublyLinkedList::offsetSet( $index, $newval )
参数:该函数接受上述和以下描述的两个参数:
- $index:它保存要设置值的索引。
- $newval:它保存要在给定索引处设置的值。
返回值:它不返回任何值。
以下示例程序旨在说明PHP中的SplDoublyLinkedList::offsetSet()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');
$list->rewind();
// Use SplDoublyLinkedList::offsetSet() function
// to set the value at given index
$list->offsetSet(1, "GeeksforGeeks");
$list->offsetSet(2, "Welcome");
var_dump($list);
?>
输出:
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(5) { [0]=> int(30) [1]=> string(13) "GeeksforGeeks" [2]=> string(7) "Welcome" [3]=> string(5) "Geeks" [4]=> string(1) "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::offsetSet() function
// to set the value at given index
$list->offsetSet(1, "Welcome");
$list->offsetSet(2, "to");
$list->offsetSet(3, "GeeksforGeeks");
print_r($list);
?>
输出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 1 [1] => Welcome [2] => to [3] => GeeksforGeeks [4] => 5 ) )
参考: https://www.php.net/manual/en/spldoublylinkedlist.offsetset.php
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