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iphone math Math 函数--> is_nan（）

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Release： 2016-07-28 08:30:11
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is_nan（）

含义：判断是否为合法数值

说明：bool is_nan(float $val)

参数：$val为要判断的值

返回值：如果 val 不是一个数字返回 TRUE，否则返回 FALSE

注：NAN代表着一个在浮点数运算中未定义或不可表述的值

以上就介绍了iphone math Math 函数--> is_nan（），包括了iphone math方面的内容，希望对PHP教程有兴趣的朋友有所帮助。

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