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is_nan

Finds whether a value is not a number (PHP 4 >= 4.2.0, PHP 5)
bool is_nan ( float val )

Checks whether val is 'not a number', like the result of acos(1.01).

Parameters

val

The value to check

Return Values

Returns TRUE if val is 'not a number', else FALSE.

See Also
is_finite()
is_infinite()


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