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is_nan() -->iphone math Math function --> is_nan()
- WBOYOriginal
- 2016-07-28 08:30:111346browse
is_nan()
Meaning: Determine whether it is a legal value
Description: bool is_nan(float $val)
Parameter: $val is the value to be judged
Return value: Ifval 不是一个数字返回 TRUE, otherwise return
FALSE
Note: NAN represents an undefined or unexpressible value in floating point operations
The above introduces the iphone math Math function --> is_nan(), including the content of iphone math. I hope it will be helpful to friends who are interested in PHP tutorials.
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