PHP 8.3.0 RC 6 available for testing

SplDoublyLinkedList::bottom

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

SplDoublyLinkedList::bottomPeeks at the node from the beginning of the doubly linked list

说明

public SplDoublyLinkedList::bottom(): mixed

参数

此函数没有参数。

返回值

The value of the first node.

错误/异常

Throws RuntimeException when the data-structure is empty.

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User Contributed Notes 3 notes

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2
tstirrat at gmail dot com
9 years ago
A note on top() and bottom():

Picture the doubly-linked list (or queue) in the same way that you would a stack.

Say you started with an empty queue, and added five values:

$myList = new SplDoublyLinkedList

$mylist->push(1)
$mylist->push(2)
$mylist->push(3)
$mylist->push(4)
$mylist->push(5)

$mylist->top()
-> 5

$mylist->bottom()
-> 1
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-2
rakesh dot mishra at gmail dot com
12 years ago
<?php

/*
* Examples of DoublyLinkedList
*/

$obj = new SplDoublyLinkedList();

// Check wither linked list is empty
if ($obj->isEmpty())
{
echo
"Adding nodes to Linked List<br>";
$obj->push(2);
$obj->push(3);

echo
"Adding the node at beginning of doubly linked list <br>";
$obj->unshift(10);
}

echo
"<br>Our Linked List:";
print_r($obj);

echo
"<br>Pick the node from beginning of doubly linked list";
echo
$obj->bottom();

?>
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-6
lincoln dot du dot j at gmail dot com
6 years ago
$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);
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