1--TEST-- 2Bug #73954 (NAN check fails on Alpine Linux with musl) 3--FILE-- 4<?php 5 6var_dump(NAN); 7var_dump(is_nan(NAN)); 8 9function takes_int(int $int) { 10} 11 12takes_int(log(tan(3.14))); 13 14?> 15--EXPECTF-- 16float(NAN) 17bool(true) 18 19Fatal error: Uncaught TypeError: Argument 1 passed to takes_int() must be of the type integer, float given, called in %s on line 9 and defined in %s:6 20Stack trace: 21#0 %s(9): takes_int(NAN) 22#1 {main} 23 thrown in %s on line 6 24