PHP も
癶
玡秈
is_nan
(PHP 4 >= 4.2.0, PHP 5)
is_nan -- 耞琌猭计
弧
bool
is_nan
( float val )
璝狦
val
獶计ㄒ
acos(1.01)
挡狦玥
TRUE
把ǎ
is_finite()
㎝
is_infinite()
癶
癬翴
玡秈
is_infinite
lcg_value