PHP 数据结构 算法 三元组 Triplet

<?php
/**
* 三元组 triplet
*
*/
class triplet
{
private $_data = null;
// 初始化三元组
public function init($val1,$val2,$val3)
{
$this->_data[0] = $val1;
$this->_data[1] = $val2;
$this->_data[2] = $val3;
return true;
}
// 销毁三元组
public function destroy()
{
unset($this->_data);
return true;
}
// 返回第$key的值
public function get($key)
{
if($key < 1 || $key > 3) return false;
return $this->_data[$key - 1];
}
// 设置第$key元的值为$val
public function put($key,$val)
{
if($key < 1 || $key > 3) return false;
$this->_data[$key - 1] = $val;
return true;
}
// 是否按升序排序
public function isascending()
{
return ($this->_data[0] <= $this->_data[1]) && ($this->_data[1] <= $this->_data[2]);
}
// 是否按降序排序
public function isdescending()
{
return ($this->_data[0] >= $this->_data[1]) && ($this->_data[1] >= $this->_data[2]);
}
// 获取最大值
public function max()
{
return ($this->_data[0] >= $this->_data[1])? ($this->_data[0] >= $this->_data[2])? $this->_data[0] : $this->_data[2] : ($this->_data[1] >= $this->_data[2])? $this->_data[1] : $this->_data[2];
}
// 获取最小值
public function min()
{
return ($this->_data[0] <= $this->_data[1])? ($this->_data[0] <= $this->_data[2])? $this->_data[0] : $this->_data[2] : ($this->_data[1] <= $this->_data[2])? $this->_data[1] : $this->_data[2];
}
}
//
$objtriplet = new triplet();
echo "init:";var_dump($objtriplet->init(1,2,3)); echo "<br/>";
echo "get 1:";var_dump($objtriplet->get(1)); echo "<br/>";
echo "get 4:";var_dump($objtriplet->get(4)); echo "<br/>"; // false
echo "put 3,4:";var_dump($objtriplet->put(3,4)); echo "<br/>";
echo "max:";var_dump($objtriplet->max()); echo "<br/>";
echo "min:";var_dump($objtriplet->min()); echo "<br/>";
echo "isascending:";var_dump($objtriplet->isascending()); echo "<br/>";
echo "isdescending:";var_dump($objtriplet->isdescending()); echo "<br/>";
?>