PHP - Manual: trader_var
2025-02-27
(PECL trader >= 0.2.0)
trader_var — Variance
$real
$timePeriod
$nbDev
real
浮点数数组。
timePeriod
Number of period. Valid range from 2 to 100000.
nbDev
Returns an array with calculated data or false on failure.
官方地址:https://www.php.net/manual/en/function.trader-var.php