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<?php var_dump(is_nan((float)'NAN'));
based on stR0i
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/0Jeva
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'is_nan'
         2        CAST                                          5  ~0      'NAN'
         3        SEND_VAL                                                 ~0
         4        DO_ICALL                                         $1      
         5        SEND_VAR                                                 $1
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0