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<is_infinitelcg_value>
Last updated: Tue, 19 Sep 2006

is_nan

(PHP 4 >= 4.2.0, PHP 5)

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().




<is_infinitelcg_value>
Last updated: Tue, 19 Sep 2006