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<?php define("\\\\a", 20); var_dump(constant("\\\\a"));
based on fdlIO
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/D2uYK
function name:  (null)
number of ops:  11
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   INIT_FCALL                                               'define'
         1        SEND_VAL                                                 '%5C%5Ca'
         2        SEND_VAL                                                 20
         3        DO_ICALL                                                 
   6     4        INIT_FCALL                                               'var_dump'
         5        INIT_FCALL                                               'constant'
         6        SEND_VAL                                                 '%5C%5Ca'
         7        DO_ICALL                                         $1      
         8        SEND_VAR                                                 $1
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0