PHP is_nan() Function – Determine If a Value Is Not a Number
The article explains PHP's is_nan() function, its signature, parameters, return values, and provides a code example showing how it identifies non‑numeric results such as NaN and returns true, making it useful for backend validation.
is_nan() is a PHP function that checks whether a given float value is not a number (NaN) and returns a boolean.
Signature: bool is_nan(float $val)
If the argument is a non‑numeric result such as acos(1.01) , the function returns true ; otherwise it returns false .
Parameter: $val – the value to be examined.
Return value: true if $val is NaN, false otherwise.
Example:
Output:
float(NAN)
bool(true)Laravel Tech Community
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