SplDoublyLinkedList::top

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplDoublyLinkedList::top — Peeks at the node from the end of the doubly linked list

说明

public SplDoublyLinkedList::top ( ) : mixed

参数

此函数没有参数。

返回值

The value of the last node.

错误／异常

Throws RuntimeException when the data-structure is empty.

User Contributed Notes

lincoln dot du dot j at gmail dot com 11-Jul-2017 05:31


$a = new SplDoublyLinkedList;

$arr=[1,2,3,4,5,6,7,8,9];



for($i=0;$i<count($arr);$i++){

    $a->add($i,$arr[$i]);

}



echo "SplDoublyLinkedList array last/top value " .  $a->top() ." \n";

echo "SplDoublyLinkedList array first/top value " . $a->bottom() . " \n\n";



print_r($a);



//Another Example

$spl = new SplDoublyLinkedList;



$spl->push(11);

$spl->push(2);

$spl->push(3);

$spl->push(8);

$spl->push(5);



//array last value

echo $spl->top();

echo PHP_EOL;

//Array first value

echo $spl->bottom();

echo PHP_EOL;



print_r($spl);