/**
* 跟踪程序运行， 记录一些时间等情况。
*
* @param string $out 是否在页面输出
*/
public static function time($key = null, $name = 'Tracer', $out = false)
{
if (empty(self::$timeTracer)) {
self::$timeTracer = array(0 => array('name' => 'start.', 'time' => time()));
}
$now = microtime(true);
// 时间跟踪器总数
$count = !empty(self::$timeTracer) ? count(self::$timeTracer) : 0;
// 距离上一个跟踪器所耗时间
end(self::$timeTracer);
$last_key = key(self::$timeTracer);
$time = $now - self::$timeTracer[$last_key]['time'];
// 添加进时间跟踪器
$key = !empty($key) ? $key : $count;
self::$timeTracer[$key] = array('name' => $key, 'time' => $now);
if ($out) {
$txt = "{$key} timer_{$count}: {$now} ,take {$time}";
echo "<br>" . $txt . "<br>";
}
}
