PHP记录代码运行时间

代码运行时间测量

一般在要求性能的代码中, 会加入测试代码进行计算。

不过每次都要写microtime, end – start 未必太麻烦了, 所以简单的写了一个类去搞。

代码

class TimeCost
{

    private $cost = array();
    private $record = array();
    private $scale = 6;
    public function __construct($scale = 6)
    {
        $this->cost = array();
        $this->record = array();
        $this->scale = $scale;
    }

    public function __toString()
    {
        return  $this->getString();
    }

    /**
     * start to cal time.
     *
     * @param mixed $key
     */
    public function addCost($key)
    {
        $this->cost[$key] = microtime(true);
    }

    /**
     * stop to cal time.
     *
     * @param mixed $key
     */
    public function closeCost($key)
    {
        $cost  = bcsub(microtime(true), $this->cost[$key], $this->scale);

        if (in_array($key, array_keys($this->record))) {
            $this->record[$key] = bcadd($cost, $this->record[$key], $this->scale);
        } else {
            $this->record[$key] = $cost;
        }
        return  $cost;
    }

    
    public function getString($key = null)
    {
        if ($key) {
            return  "{$key}[{$this->record[$key]}]";
        }

        $str = '';
        foreach ($this->record as $k => $v) {
            $str .= "{$k}[{$v}]";
        }
        return  $str;
    }
}

用法

$obj = new TimeCost();
$token = 'test_a';
$obj->addCost($token);
some_code();

$obj->closeCost($token);
$reslut = $obj->getString($token);

说明

  • 时间精度: 默认是保留了6位, 已经足够了, 想要更高精度, 可以在new对象的时候指定$scale参数

  • token: token是为了表示某段代码, 对应的结果会以key(token), value的形式写入到record数组中。

    所以用一个token多次进行addCost和closeClost的结果会进行累积。

  • getString: 传递token则返回token对应的结果, 默认会将record中的所有结果拼接返回。

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