@Blog

<?php 
 
class StopWatch 
{ 
    private static $startTime; 
    private static $lastTime; 
    private static $total = 0; 
    private static $log = []; 
 
    public static function lap($note = ''):void 
    { 
        $time = microtime(true); 

        $dbg = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0]; 
       
        if ($note !== '') { 
            $note .= ' '; 
        }
        $note .= "{$dbg['file']}#{$dbg['line']}"; 

        self::timeCalc($time,$note);
    }
 
    private static function timeCalc($time,$note):void
    {
        self::$startTime = self::$startTime??$time; 
        self::$lastTime = self::$lastTime??$time;
        
        $lap = $time - self::$lastTime; 
        self::$lastTime = $time; 
        self::$total = $time - self::$startTime; 
 
        self::$log[] = [ 
            'total' => sprintf('%.6f', self::$total), 
            'lap'   => sprintf('%.6f', $lap), 
            'note'  => $note, 
        ];
    }
 
    public static function getLog():array 
    { 
        return self::$log; 
    } 
}