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PHP is_nan() Function

PHP Math Reference Manual

Example

Determine if a value is not a number:


Definition and Usage

The is_nan() function checks if a value is not a number.

If the specified value is not a number, the function returns true (1). Otherwise, it returns false/nothing.


Syntax

Parameter Description
value Required. The value to be checked.

Technical Details

Return Value: Returns TRUE if the value is not a number. Otherwise, returns FALSE.
Return Type: Boolean
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PHP Version: 4.2+
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