/**
* {@inheritdoc}
*/
public function getOpcode()
{
if (count($this->_frames) == 0) {
throw new \UnderflowException('No frames have been added to this message');
}
return $this->_frames->bottom()->getOpcode();
}
/**
* @return boolean
*/
public function isBinary()
{
if ($this->_frames->isEmpty()) {
throw new \UnderflowException('Not enough data has been received to determine if message is binary');
}
return Frame::OP_BINARY === $this->_frames->bottom()->getOpcode();
}
$list->key(); // count() // 获得链表的数量 $list->count(); // rewind() // 将指针返回至初始节点 $list->rewind(); // current() // 获得当前节点 $list->current(); // top() // 返回最后一个节点的值 $list->top(); // bottom() // 返回第一个节点的值 $list->bottom(); // next() // 指针移到下一个节点 $list->next(); // prev() // 指针移到上一个节点, 如果原本指针在第一个，那么前一个节点为-1，并且将无法获得当前值 $list->prev(); // valid() // 判断该链表是否有更多的值，返回bool $list->valid(); // isEmpty() // 判断该链表是否为空链表，返回bool $list->isEmpty(); // offsetExists($index) // 判断参索引是否存在，返回bool $list->offsetExists(2);
$dll->shift();
} catch (RuntimeException $e) {
echo "Exception: " . $e->getMessage() . "\n";
}
// data consistency
$a = 2;
$dll->push($a);
echo $dll->pop() . "\n";
$a = 2;
$dll->unshift($a);
echo $dll->shift() . "\n";
// peakable
$dll->push(1);
$dll->push(2);
echo $dll->top() . "\n";
echo $dll->bottom() . "\n";
$dll->pop();
$dll->pop();
// countable
$dll->push(NULL);
$dll->push(NULL);
echo count($dll) . "\n";
echo $dll->count() . "\n";
var_dump($dll->pop());
var_dump($dll->pop());
// clonable
$dll->push(2);
$dll_clone = clone $dll;
$dll_clone->pop();
echo count($dll) . "\n";
?>
<?php
$list = new SplDoublyLinkedList();
$list->push("top");
$list->bottom(45);
<?php
$list = new SplDoublyLinkedList();
$list->push("top");
$list->bottom(array());
<?php
$list = new SplDoublyLinkedList();
$list->push("top");
$list->bottom(3.14159);
<?php
$list = new SplDoublyLinkedList();
$list->push("top");
$list->bottom(null);
<?php
$list = new SplDoublyLinkedList();
$list->push('oh');
$list->push('hai');
$list->push('thar');
echo $list->bottom() . "\n";
$list->offsetUnset(0);
echo $list->bottom() . "\n";
<?php
$dll = new SplDoublyLinkedList();
$dll->push('Never');
$dll->push('gonna');
$dll->push('give');
// at pos 0, shift everything up
$dll->add(0, 'you');
// Should be the end
$dll->add(4, 'up');
// Somewhere in the middle
$dll->add(2, 'let');
try {
// Key 12 is unaccessible
$dll->add(12, 'down');
} catch (OutOfRangeException $e) {
echo $e->getMessage(), PHP_EOL;
}
foreach ($dll as $key => $val) {
echo $key . '=>' . $val, PHP_EOL;
}
echo "count(): " . $dll->count(), PHP_EOL;
echo "top(): " . $dll->top(), PHP_EOL;
echo "bottom(): " . $dll->bottom(), PHP_EOL;
/**
* Peeks a `Token` from the beginning of the list.
*
* @return Token The first token.
* @link http://www.php.net/manual/en/spldoublylinkedlist.bottom.php
*/
public function bottom()
{
return $this->tokens->bottom();
}
