   #PHP Manual Mathematical Functions is_infinite lcg_value

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                                    is_nan

   (PHP 4 >= 4.2.0)
   is_nan -- Finds whether a value is not a number

Description

   bool is_nan ( float val)

   Returns TRUE if val is 'not a number', like the result of acos(1.01).

   See also is_finite() and is_infinite().
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