is_finite Finds whether a value is a legal finite number &reftitle.description; boolis_finite floatval Checks whether val is a legal finite on this platform. &reftitle.parameters; val The value to check &reftitle.returnvalues; &true; if val is a legal finite number within the allowed range for a PHP float on this platform, else &false;. &reftitle.seealso; is_infinite is_nan