PHP static关键字的用法及注意点

面试题 2020-03

题目

解答

<?php
class Monitor
{
  private $second; //秒数
  private $eave; //预期值
  public function __construct($n, $e)
  {
    $this->eave = $e;
    $this->second = $n;
  }
  public function checkException(int $v): bool
  {
    static $num = 0; //调用次数
    static $arr_v = []; // 指标集合
    $eave = $this->eave;
    $second = $this->second;
    $arr_v[] = $v;
    $max_v = max($arr_v);
    $num++;
    if(($max_v < $eave) && ($num > $second)){ //true 报警
      $num = 0; //重置
      return true;
    }else if($num > $second){ //超时重置
      $num = 0; //重置
      return false;
    }else{
      return false;
    }
  }
}
$obj = new Monitor(5,8);
var_dump($obj->checkException(3));
var_dump($obj->checkException(9));
var_dump($obj->checkException(3));
var_dump($obj->checkException(3));
var_dump($obj->checkException(3));
var_dump($obj->checkException(3));

参考资料:
PHP static关键字的用法及注意点