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is_nan - Whether a value is a number
bool is_nan( float $x )
is_nan() checks whether x is 'not a number', like the result of acos(1.01).
x - The number to process. It can be a scalar or an array.
true or false depending on whether x is NAN. If x is an array, the return value will also be an array.
1.0 and above.