3v4l.org

run code in 300+ PHP versions simultaneously
<?php $things = [NAN, is_nan(NAN), is_float(NAN), is_int(NAN), var_dump(NAN)]; $len = count($things); for ($i = 0; $i < $len; $i++) { print_r($things[$i]); }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
float(NAN) NAN11

preferences:
194.45 ms | 404 KiB | 326 Q