//實現基本隊列

class Queues

{

private $head;

private $tail;

private $cnt; //數組大小

private $array = [];

public function __construct($n = 5)

{

$this->cnt = $n;

$this->head = 0;

$this->tail = 0;

}

//數組實現隊列

public function basisEnQueue($val)

{

//隊列已滿

if ($this->tail == $this->cnt) {

return false;

}

$this->array[$this->tail] = $val;

$this->tail++;

return true;

}

//出隊列

public function basisDelQueue()

{

//隊列為空

if ($this->head == $this->tail) {

return false;

}

$ret = $this->array[$this->head];

unset($this->array[$this->head]);

$this->head++;

return $ret;

}

//隊列遷移 使用已刪除空間

public function migrationEnQueue($val)

{

//隊列已滿

if ($this->tail == $this->cnt) {

//tail ==n && head==0，表示整個隊列都占滿了

if ($this->head == 0) {

return false;

}

for ($i = $this->head; $i < $this->tail; $i++) {

$this->array[$i - $this->head] = $this->array[$i];

unset($this->array[$i]);

}

$this->tail = $this->tail - $this->head;

$this->head = 0;

}

$this->array[$this->tail] = $val;

$this->tail++;

return true;

}

}

$q = new Queues();

$q->basisEnQueue('a');

$q->basisEnQueue('b');

$q->basisEnQueue('c');

$q->basisEnQueue('d');

$q->basisEnQueue('f');

$r1 = $q->basisDelQueue();

$r2 = $q->basisDelQueue();

// $q->migrationEnQueue('g');

// var_dump($q);exit;

//循環隊列

class CircularQueue

{

private $head;

private $tail;

private $cnt; //數組大小

private $array = [];

public function __construct($n = 5)

{

$this->cnt = $n;

$this->head = 0;

$this->tail = 0;

}

public function enqueue($val)

{

//(tail+1)%n=head 隊列滿的時候

if (($this->tail + 1) % $this->cnt == $this->head) {

return false;

}

$this->array[$this->tail] = $val;

$this->tail = ($this->tail + 1) % $this->cnt;

return true;

}

public function dequeue()

{

//如果head == tail 表示隊列為空

if ($this->head == $this->tali) {

return false;

}

$ret = $this->array[$this->head];

unset($this->array[$this->head]);

$this->head = ($this->head + 1) % $this->cnt;

return $ret;

}

}

$c = new CircularQueue;

$c->enqueue('a');

$c->enqueue('b');

$c->enqueue('c');

var_dump($c);exit;

總結

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