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<?php var_dump(NAN < 0); $x=NAN; var_dump($x < 0);
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/Fla0D
function name:  (null)
number of ops:  9
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        SEND_VAL                                                 <false>
         2        DO_ICALL                                                 
   6     3        ASSIGN                                                   !0, NAN
   7     4        INIT_FCALL                                               'var_dump'
         5        IS_SMALLER                                       ~3      !0, 0
         6        SEND_VAL                                                 ~3
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0