php 链表队列
实例代码：
class Queue{ private $last; private $first; private $oldfirst; private static $n=0; public function __construct(){ $this->last = null; $this->first = null; $this->oldfirst = null; } public function push($item){ $this->oldfirst = $this->last; $this->last = new Node(); $this->last->item = $item; $this->last->next = null; if(empty($this->first)){ $this->first = $this->last; }else{ $this->oldfirst->next = $this->last; } self::$n++; } public function pop(){ if(self::$n<0){ return null; } $item = $this->first->item; $this->first = $this->first->next; self::$n--; return $item; } } class Node{ public $item; public $next; } $Queue = new Queue(); $Queue->push("a"); $Queue->push("b"); $Queue->push("c"); echo $Queue->pop().PHP_EOL; echo $Queue->pop().PHP_EOL; echo $Queue->pop().PHP_EOL; echo $Queue->pop().PHP_EOL;
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