stats_harmonic_mean
(PECL stats >= 1.0.0)
stats_harmonic_mean — Returns the harmonic mean of an array of values
参数
a-
The input array
返回值
Returns the harmonic mean of the values in a,
or false if a is empty or is not an array.
(PECL stats >= 1.0.0)
stats_harmonic_mean — Returns the harmonic mean of an array of values
aThe input array
Returns the harmonic mean of the values in a,
or false if a is empty or is not an array.