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이 문서에서는 PHP 중국어 웹사이트 매뉴얼 풀어 주다
(PECL trader >= 0.2.0)
trader_rocr — Rate of change ratio: (price/prevPrice)
$real
[, integer $timePeriod
] )
real
浮点数数组。
timePeriod
Number of period. Valid range from 2 to 100000.
Returns an array with calculated data or false on failure.
[#1] mityaev_ivan at mail dot ru [2014-03-02 09:59:12]
timePeriod can be from 1 (not from 2)
Working correctly, and tis is common need to calculate change from previos period.