/**
* Calculate the time cut-off for a trivial step
*
* Utilizes the {@link profiler::$trivialThreshold} value to determine how fast a step must be to be regarded "trivial"
*
* @uses profiler::$trivialThresdhold
* @see profiler::$trivialThresholdMS
*/
protected static function calculateThreshold()
{
if (count(self::$childDurations)) {
foreach (self::$childDurations as &$childDuration) {
$childDuration = round($childDuration * 1000, 1);
}
sort(self::$childDurations);
self::$trivialThresholdMS = self::$childDurations[floor(count(self::$childDurations) * self::$trivialThreshold)];
}
}